# Quiz 2: Motion Along a Straight Line

Physics & Astronomy

Q 1Q 1

When can you treat a moving object as if it were a point-like particle?
A)Only if it really is a point-like particle.
B)You can always treat a moving object as if it were a point-like particle.
C)Only if the object is moving with constant acceleration.
D)Only if all parts of the object are moving in the same direction and at the same rate.
E)This question has no physical meaning.

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Multiple Choice

D

Q 2Q 2

A particle moves along the x axis from x

_{i}to x_{ f }.Of the following values of the initial and final coordinates, which results in the displacement with the largest magnitude? A)x_{i}= 4m, x_{ f }= 6m B)x_{i}= -4m, x_{ f }= -8m C)x_{i}_{ }= -4m, x_{ f }= 2m D)x_{i}= 4m, x_{ f }= -2m E)x_{i}= -4m, x_{ f }= 4mFree

Multiple Choice

E

Q 3Q 3

A particle moves along the x axis from x

_{i}to x_{ f }.Of the following values of the initial and final coordinates, which results in a negative displacement? A)x_{i}= 4m, x_{ f }= 6m B)x_{i}= -4m, x_{ f }= -8m C)x_{i}= -4m, x_{ f }= 2m D)x_{i}= -4m, x_{ f }= -2m E)x_{i}= -4m, x_{ f }= 4mFree

Multiple Choice

B

Q 4Q 4

A particle moves from point x

_{1}to point x_{2}.Its displacement is given by: A)x_{2}- x_{1}B)x_{1}- x_{2}C)x_{1}+ x_{2}D)x_{1}E)x_{2}Free

Multiple Choice

Q 5Q 5

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither.The time for this round trip is 2 hours.The magnitude of the average velocity of the car for this round trip is:
A)0 km/hr
B)50 km/hr
C)100 km/hr
D)200 km/hr
E)cannot be calculated without knowing the acceleration

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Multiple Choice

Q 6Q 6

The coordinate of an object is given as a function of time by x = 7t - 3t

^{2}, where x is in meters and t is in seconds.Its average velocity over the interval from t = 0 to t = 2 s is: A)5 m/s B)-5 m/s C)11 m/s D)-11 m/s E)1 m/sFree

Multiple Choice

Q 7Q 7

The position y of a particle moving along the y axis depends on the time t according to the equation y = at - bt

^{2}.The dimensions of the quantities a and b are respectively: A)L^{2}/T, L^{3}/T^{2}B)L/T^{2}, L^{2}/T C)L/T, L/T^{2}D)L^{3}/T, T^{2}/L E)none of theseFree

Multiple Choice

Q 8Q 8

The average speed of a moving object during a given interval of time is always:
A)the magnitude of its average velocity over the interval
B)the distance covered during the time interval divided by the time interval
C)one-half its speed at the end of the interval
D)its acceleration multiplied by the time interval
E)one-half its acceleration multiplied by the time interval.

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Multiple Choice

Q 9Q 9

Two automobiles are 150 kilometers apart and traveling toward each other.One automobile is moving at 60 km/h and the other is moving at 40 km/h.In how many hours will they meet?
A)2.5 h
B)2.0 h
C)1.75 h
D)1.5 h
E)1.25 h

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Multiple Choice

Q 10Q 10

A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h.The average speed of the car for this 80 km trip is:
A)40 km/h
B)45 km/h
C)53 km/h
D)60 km/h
E)80 km/h

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Multiple Choice

Q 11Q 11

A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither.The time for this round trip is 2 hours.The average speed of the car for this round trip is:
A)0 km/h
B)25 km/h
C)50 km/h
D)100 km/h
E)cannot be calculated without knowing the acceleration

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Multiple Choice

Q 12Q 12

You leave your house and drive to your friend's house, where you stay a while.Then you come back home.Which of the following must be true of your trip?
A)Your instantaneous velocity was never zero.
B)Your average velocity was zero.
C)Your acceleration was constant.
D)Your net displacement was not zero.
E)Your average speed was zero.

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Multiple Choice

Q 13Q 13

Which of the following five coordinate versus time graphs represents the motion of an object whose speed is increasing?
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 14Q 14

This graph shows the position of a particle as a function of time.What is its average velocity between t = 5s and t = 9s?
A)3 m/s
B)-3 m/s
C)12 m/s
D)-12 m/s
E)Need additional information.

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Multiple Choice

Q 15Q 15

The coordinate of a particle in meters is given by x(t)= 16t - 3.0t

^{3}, where the time t is in seconds.The particle is momentarily at rest at t = A)0.75 s B)1.3 s C)1.8 s D)5.3 s E)7.3 sFree

Multiple Choice

Q 16Q 16

Each of four particles moves along an x axis.Their coordinates (in meters)as functions of time (in seconds)are given by For which of these particles is the velocity increasing for t > 0?
A)All four
B)Only 1
C)Only 2 and 3
D)Only 2, 3, and 4
E)None of them

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Multiple Choice

Q 17Q 17

The coordinate of an object is given as a function of time by x = 7t - 3t

^{2}, where x is in meters and t is in seconds.Its velocity at t = 3s is: A)-6 m/s B)-11 m/s C)-21 m/s D)9 m/s E)18 m/sFree

Multiple Choice

Q 18Q 18

Which of the following five coordinate versus time graphs represents the motion of an object moving with a constant nonzero speed?
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 19Q 19

This graph shows the position of a particle as a function of time.What is its instantaneous velocity at t = 7s?
A)3 m/s
B)-3 m/s
C)12 m/s
D)-12 m/s
E)Need additional information.

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Multiple Choice

Q 20Q 20

The coordinate-time graph of an object is a straight line with a positive slope.The object has:
A)constant displacement
B)steadily increasing acceleration
C)steadily decreasing acceleration
D)constant velocity
E)steadily increasing velocity

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Multiple Choice

Q 21Q 21

What is the relationship between instantaneous speed and instantaneous velocity?
A)They are identical.
B)Instantaneous speed is the rate at which the instantaneous velocity is changing.
C)Instantaneous speed is the magnitude of the instantaneous velocity.
D)They are unrelated.
E)Instantaneous speed is the initial speed minus the final speed.

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Multiple Choice

Q 22Q 22

A ball rolls up a slope.At the end of three seconds its velocity is 20 cm/s; at the end of eight seconds its velocity is 0 cm/s.What is the magnitude of its average acceleration from the third to the eighth second?
A)2.5 cm/s

^{2}B)4.0 cm/s^{2}C)5.0 cm/s^{2}D)6.0 cm/s^{2}E)6.67 cm/s^{2}Free

Multiple Choice

Q 23Q 23

Over a short interval near time t = 0 the coordinate of an automobile in meters is given by x(t)= 27t - 4.0t

^{3}, where t is in seconds.At the end of 1.0 s the acceleration of the auto is: A)23 m/s^{2}B)15 m/s^{2}C)-4.0 m/s^{2}D)-12 m/s^{2}E)-24 m/s^{2}Free

Multiple Choice

Q 24Q 24

The coordinate of an object is given as a function of time by x = 4t

^{2}- 3t^{3}, where x is in meters and t is in seconds.Its average acceleration over the interval from t = 0 to t = 2 s is: A)-8 m/s^{2}B)4 m/s^{2}C)-10 m/s^{2}D)10 m/s^{2}E)-13 m/s^{2}Free

Multiple Choice

Q 25Q 25

Each of four particles moves along an x axis.Their coordinates (in meters)as functions of time (in seconds)are given by Which of these particles have constant acceleration?
A)All four
B)Only 1 and 2
C)Only 2 and 3
D)Only 3 and 4
E)None of them

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Multiple Choice

Q 26Q 26

Throughout a time interval, while the speed of a particle increases as it moves along the x axis, its velocity and acceleration could be:
A)positive and negative, respectively
B)negative and positive, respectively
C)negative and negative, respectively
D)negative and zero, respectively
E)positive and zero, respectively

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Multiple Choice

Q 27Q 27

A particle moves on the x axis.When its acceleration is positive and increasing:
A)its velocity must be positive
B)its velocity must be negative
C)it must be slowing down
D)it must be speeding up
E)none of the above must be true

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Multiple Choice

Q 28Q 28

Of the following situations, which one is impossible?
A)A body having velocity east and acceleration east
B)A body having velocity east and acceleration west
C)A body having zero velocity and non-zero acceleration
D)A body having constant acceleration and variable velocity
E)A body having constant velocity and variable acceleration

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Multiple Choice

Q 29Q 29

Can an object have positive acceleration and decreasing speed?
A)No, this is not possible.
B)Yes, speed will always decrease if acceleration is positive.
C)Yes, this is possible if the initial velocity is zero.
D)Yes, this is possible if the initial velocity is negative.
E)Yes, this is possible but only if the object is moving in two dimensions.

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Multiple Choice

Q 30Q 30

Which of the following five acceleration versus time graphs is correct for an object moving in a straight line at a constant velocity of 20 m/s?
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 31Q 31

All falling objects experience some air resistance, the effect of which is to decrease acceleration.When the falling object's acceleration reaches zero, the acceleration stops changing.Therefore, if you drop an object and it falls far enough for this to happen,
A)its speed continues to increase all the way down.
B)its speed reaches a maximum value and then decreases.
C)its speed reaches a maximum value and then doesn't change.
D)its speed reaches a maximum value, decreases, and then increases again.
E)Any of these things could happen.

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Multiple Choice

Q 32Q 32

Is it possible for an object to have zero velocity and constant nonzero acceleration?
A)Yes, but only if it is not moving at all.
B)No, if its velocity is zero its acceleration must also be zero.
C)Yes, all objects with zero velocity have nonzero acceleration.
D)No, if its acceleration is not zero its velocity cannot be zero.
E)Yes, but its velocity must only be zero for an instant.

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Multiple Choice

Q 33Q 33

Over a short interval, starting at time t = 0, the coordinate of an automobile in meters is given by x(t)= 27t - 4.0t

^{3}, where t is in seconds.The magnitudes of the initial (at t = 0)velocity and acceleration of the auto respectively are: A)0 m/s; 12 m/s^{2}B)0 m/s; 24 m/s^{2}C)27 m/s; 0 m/s^{2}D)27 m/s; 12 m/s^{2}E)27 m/s; 24 m/s^{2}Free

Multiple Choice

Q 34Q 34

Starting at time t = 0, an object moves along a straight line with velocity in m/s given by v(t)= 98 - 2t

^{2}, where t is in seconds.When it momentarily stops its acceleration is: A)0 m/s^{2}B)-4.0 m/s^{2}C)-9.8 m/s^{2}D)-28 m/s^{2}E)49 m/s^{2}Free

Multiple Choice

Q 35Q 35

Starting at time t = 0, an object moves along a straight line.Its coordinate in meters is given by x(t)= 75t - 1.0t

^{3}, where t is in seconds.When it momentarily stops its acceleration is: A)0 m/s^{2}B)-73 m/s^{2}C)-30 m/s^{2}D)-9.8 m/s^{2}E)9.2 x 10^{3}m/s^{2}Free

Multiple Choice

Q 36Q 36

A particle moves along the x axis according to the equation x = 6t

^{2}where x is in meters and t is in seconds.Therefore: A)the acceleration of the particle is 6 m/s^{2}B)t cannot be negative C)the particle follows a parabolic path D)each second the velocity of the particle changes by 9.8 m/s E)none of the aboveFree

Multiple Choice

Q 37Q 37

A car accelerates from rest on a straight road.A short time later, the car decelerates to a stop and then returns to its original position in a similar manner, by speeding up and then slowing to a stop.Which of the following five coordinate versus time graphs best describes the motion?
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 38Q 38

The diagram shows a velocity-time graph for a car moving in a straight line.At point Q the car must be:
A)moving with zero acceleration
B)traveling downhill
C)traveling below ground-level
D)reducing speed
E)traveling in the reverse direction to that at point P

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Multiple Choice

Q 39Q 39

The diagram shows a velocity-time graph for a car moving in a straight line.At point P the car must be:
A)moving with zero acceleration
B)climbing the hill
C)accelerating
D)stationary
E)moving at about 45° with respect to the x axis

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Multiple Choice

Q 40Q 40

The diagram represents the straight line motion of a car.Which of the following statements is true?
A)The car's speed increases, then it stops, and reverses
B)The car accelerates at 6 m/s

^{2}for the first 2 s C)The car is moving for a total time of 12 s D)The car accelerates at -12 m/s^{2}for the last 4 s E)The car returns to its starting point when t = 9 sFree

Multiple Choice

Q 41Q 41

Consider the following five graphs (note the axes carefully).Which of these represent(s)motion at constant speed?
A)IV only
B)IV and V only
C)I, II, and III only
D)I and II only
E)I and IV only

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Multiple Choice

Q 42Q 42

A car, initially at rest, travels 20 m in 4 s along a straight line with constant acceleration.The acceleration of the car is:
A)1.3 m/s

^{2}B)2.5 m/s^{2}C)4.9 m/s^{2}D)9.8 m/s^{2}E)There is not enough information to answer this question.Free

Multiple Choice

Q 43Q 43

A racing car traveling with constant acceleration increases its speed from 10 m/s to 30 m/s over a distance of 60 m? How long does this take?
A)2.0 s
B)3.0 s
C)5.0 s
D)6.0 s
E)The time cannot be calculated since the speed is not constant

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Multiple Choice

Q 44Q 44

A car starts from rest and goes down a slope with a constant acceleration of 5 m/s

^{2}.After 5 seconds the car reaches the bottom of the hill.What is its speed at the bottom of the hill? A)1 m/s B)12.5 m/s C)25 m/s D)50 m/s E)160 m/sFree

Multiple Choice

Q 45Q 45

A car moving with an initial velocity of 25 m/s north has a constant acceleration of 3 m/s

^{2}south.After 6 seconds its velocity will be: A)7 m/s north B)7 m/s south C)43 m/s north D)20 m/s north E)20 m/s southFree

Multiple Choice

Q 46Q 46

An object with an initial velocity of 12 m/s west experiences a constant acceleration of 4 m/s

^{2}west for 3 seconds.During this time the object travels a distance of: A)18 m B)24 m C)36 m D)54 m E)144 mFree

Multiple Choice

Q 47Q 47

How far does a car travel in 6 s if its initial velocity is 2 m/s and its acceleration is 2 m/s

^{2}in the same direction as its initial velocity? A)12 m B)14 m C)24 m D)36 m E)48 mFree

Multiple Choice

Q 48Q 48

At a stop light, a truck traveling at 15 m/s passes a car as it starts from rest.The truck travels at constant velocity and the car accelerates at 3 m/s

^{2}.How much time does the car take to catch up to the truck? A)5 s B)10 s C)15 s D)20 s E)25 sFree

Multiple Choice

Q 49Q 49

An object starts from rest and has a constant acceleration of 3 m/s

^{2}.The position versus time graph for this object has a slope: A)that increases with time B)that is constant C)that decreases with time D)of 3 m/s E)of 3 m/s^{2}Free

Multiple Choice

Q 50Q 50

An object starts from rest at the origin and moves along the x axis with a constant acceleration of 4 m/s

^{2}.Its average velocity as it goes from x = 2 m to x = 8 m is: A)1 m/s B)2 m/s C)3 m/s D)5 m/s E)6 m/sFree

Multiple Choice

Q 51Q 51

The graph represents the straight line motion of a car.How far does the car travel between t = 2 seconds and t = 5 seconds?
A)4 m
B)12 m
C)24 m
D)36 m
E)60 m

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Multiple Choice

Q 52Q 52

The acceleration of an object, starting from rest, is shown in the graph below.Other than at t = 0, when is the velocity of the object equal to zero?
A)During the interval from 1.0 s to 3.0 s
B)At t = 3.5 s
C)At t = 4.0 s
D)At t = 5.0 s
E)At no other time less than or equal to 5 s.

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Multiple Choice

Q 53Q 53

At time t = 0 a car has a velocity of 16 m/s.It slows down with an acceleration given by a = -0.50t, in m/s

^{2}for t in seconds.By the time it stops it has traveled: A)15 m B)31 m C)62 m D)85 m E)100 mFree

Multiple Choice

Q 54Q 54

At time t = 0 a car has a velocity of 16 m/s.It slows down with an acceleration given by a = -0.50t, in m/s

^{2}for t in seconds.It stops at t = A)64 s B)32 s C)16 s D)8.0 s E)4.0 sFree

Multiple Choice

Q 55Q 55

At time t = 0 a car has a velocity of 16 m/s.It slows down with an acceleration given by a = -0.50t, in m/s

^{2}for t in seconds.At the end of 4.0 s it has traveled: A)0 B)12 m C)14 m D)25 m E)59 mFree

Multiple Choice

Q 56Q 56

The area under a velocity-time graph represents:
A)acceleration
B)change in acceleration
C)speed
D)change in velocity
E)displacement

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Multiple Choice

Q 57Q 57

The velocity of an object is given as a function of time by v = 4t - 3t

^{2}, where v is in m/s and t is in seconds.Its average velocity over the interval from t = 0 s to t = 2 s: A)is 0 B)is -2 m/s C)is 2 m/s D)is -4 m/s E)cannot be calculated unless the initial position is givenFree

Multiple Choice

Q 58Q 58

Displacement can be obtained from:
A)the slope of an acceleration-time graph
B)the slope of a velocity-time graph
C)the area under an acceleration-time graph
D)the area under a velocity-time graph
E)the slope of an acceleration-time graph

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Multiple Choice

Q 59Q 59

A drag racing car starts from rest at t = 0 and moves along a straight line with velocity given by v = bt

^{2}, where b is a constant.The expression for the distance traveled by this car from its position at t = 0 is: A)bt^{3}B)bt^{3}/3 C)4bt^{2}D)3bt^{2}E)bt^{3/2 }Free

Multiple Choice

Q 60Q 60

A ball is in free fall motion.Upward is taken to be the positive direction.The displacement of the ball is:
A)positive during both ascent and descent
B)negative during both ascent and descent
C)negative during ascent and positive during descent
D)positive during ascent and negative during descent
E)none of the above

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Multiple Choice

Q 61Q 61

Which of the following is NOT true of an object in free fall in the absence of air resistance?
A)Its acceleration is constant.
B)If its initial velocity is upwards, it will reach a maximum height and then begin to fall.
C)If its initial velocity is zero, its position below its starting point can be calculated knowing only how long ago it began falling.
D)Its velocity will always be zero at some point along its path.
E)Its velocity changes by the same amount every second.

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Multiple Choice

Q 62Q 62

An object is shot vertically upward.While it is rising:
A)its velocity and acceleration are both upward
B)its velocity is upward and its acceleration is downward
C)its velocity and acceleration are both downward
D)its velocity is downward and its acceleration is upward
E)its velocity and acceleration are both decreasing

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Multiple Choice

Q 63Q 63

A baseball is thrown vertically into the air.The acceleration of the ball at its highest point is:
A)zero
B)g, down
C)g, up
D)2g.down
E)2g, up

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Multiple Choice

Q 64Q 64

A feather, initially at rest, is released in a vacuum 12 m above the surface of the Earth.Which of the following statements is correct?
A)The maximum velocity of the feather is 9.8 m/s
B)The acceleration of the feather decreases until terminal velocity is reached
C)The acceleration of the feather remains constant during the fall
D)The acceleration of the feather increases during the fall
E)The acceleration of the feather is zero

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Multiple Choice

Q 65Q 65

A ball is thrown upwards.Its acceleration is:
A)downward during both ascent and descent
B)downward during ascent and upward during descent
C)upward during ascent and downward during descent
D)upward during both ascent and descent
E)downward at all times except at the very top, when it is zero

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Multiple Choice

Q 66Q 66

An elevator is moving upward with constant acceleration.The dashed curve shows the position y of the ceiling of the elevator as a function of the time t.At the instant indicated by the dot, a bolt breaks loose and drops from the ceiling.Which curve best represents the position of the bolt as a function of time?
A)A
B)B
C)C
D)D
E)E

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Multiple Choice

Q 67Q 67

If you drop a rock and a feather, the rock hits the ground first.This demonstrates that:
A)The acceleration of gravity is not constant.
B)Heavier objects are accelerated faster by gravity than lighter objects are.
C)Air resistance has a larger effect on feathers than on rocks.
D)Rocks can't fly.
E)Gravity has little effect on a feather.

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Multiple Choice

Q 68Q 68

As a rocket is accelerating vertically upward at 9.8 m/s

^{2}near the Earth's surface, it releases a projectile.Immediately after release the acceleration of the projectile is: A)9.8 m/s^{2}down B)0 m/s^{2}C)9.8 m/s^{2}up D)19.6 m/s^{2}up E)none of the aboveFree

Multiple Choice

Q 69Q 69

Which one of the following statements is correct for an object in free fall released from rest?
A)The average velocity during the first second of time is 4.9 m/s
B)During each second the object falls 9.8 m
C)The acceleration changes by 9.8 m/s every second
D)The object falls 9.8 m during the first second of time
E)The acceleration of the object is proportional to its weight

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Multiple Choice

Q 70Q 70

A freely falling body has a constant acceleration of 9.8 m/s

^{2}.This means that: A)the body falls 9.8 m during each second B)the body falls 9.8 m during the first second C)the speed of the body increases by 9.8 m/s during each second D)the acceleration of the body increases by 9.8 m/s^{2}during each second E)the acceleration of the body decreases by 9.8 m/s^{2}during each secondFree

Multiple Choice

Q 71Q 71

An object is thrown straight up from ground level with a speed of 50 m/s.If g = 10 m/s

^{2}its distance above ground level 1.0 second later is: A)40 m B)45 m C)50 m D)55 m E)60 mFree

Multiple Choice

Q 72Q 72

An object is thrown straight up from ground level with a speed of 50 m/s.If g = 10 m/s

^{2}its distance above ground level 6.0 s later is: A)0.00 m B)270 m C)330 m D)480 m E)none of theseFree

Multiple Choice

Q 73Q 73

At a location where g = 9.80 m/s

^{2}, an object is thrown vertically down with an initial speed of 1.00 m/s.After 5.00 s the object will have traveled: A)125 m B)128 m C)245 m D)250 m E)255 mFree

Multiple Choice

Q 74Q 74

An object is thrown vertically upward at 35 m/s.Taking g = 10 m/s

^{2}, the velocity of the object 5 seconds later is: A)7.0 m/s up B)15 m/s down C)15 m/s up D)85 m/s down E)85 m/s upFree

Multiple Choice

Q 75Q 75

An object is released from rest.How far does it fall during the second second of its fall?
A)4.9 m
B)9.8 m
C)15 m
D)20 m
E)25 m

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Multiple Choice

Q 76Q 76

A heavy ball falls freely, starting from rest.Between the third and fourth second of its fall it travels a distance of:
A)4.9 m.
B)9.8 m.
C)29.4 m
D)34.3 m.
E)39.8 m.

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Multiple Choice

Q 77Q 77

A stone is released from a balloon that is descending at a constant speed of 10 m/s.Neglecting air resistance, after 20 s the speed of the stone is:
A)2160 m/s
B)1760 m/s
C)206 m/s
D)196 m/s
E)186 m/s

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Multiple Choice

Q 78Q 78

An object dropped from a window of a tall building hits the ground in 12.0 s.If its acceleration is 9.80 m/s

^{2}, the height of the window above the ground is (you may neglect air resistance): A)29.4 m B)58.8 m C)118 m D)353 m E)706 mFree

Multiple Choice

Q 79Q 79

Neglecting the effect of air resistance, a stone dropped off a 175-m high building lands on the ground in:
A)3 s
B)4 s
C)6 s
D)18 s
E)36 s

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Multiple Choice

Q 80Q 80

A stone is thrown vertically upward with an initial speed of 19.5 m/s.It will rise to a maximum height of:
A)4.9 m
B)9.8 m
C)19.4 m
D)38.8 m
E)none of these

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Multiple Choice

Q 81Q 81

A baseball is hit straight up and is caught by the catcher 2.0 s later, at the same height at which it left the bat.The maximum height of the ball during this interval is:
A)4.9 m
B)7.4 m
C)12.4 m
D)19.6 m
E)38.8 m

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Multiple Choice

Q 82Q 82

An object is thrown straight down with an initial speed of 4 m/s from a window which is 8 m above the ground.The time it takes the object to reach the ground is:
A)0.80 s
B)0.93 s
C)1.3 s
D)1.7 s
E)2.0 s

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Multiple Choice

Q 83Q 83

A stone is released from rest from the edge of a building roof 190 m above the ground.Neglecting air resistance, the speed of the stone, just before striking the ground, is:
A)43 m/s
B)61 m/s
C)120 m/s
D)190 m/s
E)1400 m/s

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Multiple Choice

Q 84Q 84

An object is thrown vertically upward with a certain initial velocity in a world where the acceleration due to gravity is 19.6 m/s

^{2}.The height to which it rises is ____ that to which the object would rise if thrown upward with the same initial velocity on the Earth.Neglect air resistance. A)one fourth B)half C)twice D)four times E)cannot be calculated from the given dataFree

Multiple Choice

Q 85Q 85

A projectile is shot vertically upward with a given initial velocity.It reaches a maximum height of 100 m.If on a second shot the initial velocity is doubled, then the projectile will reach a maximum height of:
A)70.7 m
B)141.4 m
C)200 m
D)241 m
E)400 m

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Multiple Choice

Q 86Q 86

One object is thrown vertically upward with an initial velocity of 100 m/s and another object with an initial velocity of 10 m/s.The maximum height reached by the first object will be _______ that of the other.
A)10 times
B)100 times
C)1000 times
D)10,000 times
E)none of these

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Multiple Choice

Q 87Q 87

An object is dropped from rest.Which of the five following graphs correctly represents its motion? The positive direction is taken to be upward.Take careful note of the axes.
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 88Q 88

A stone is dropped from a cliff.The graph (carefully note the axes)that best represents its motion while it falls is:
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 89Q 89

An object is thrown vertically into the air.Which of the following five graphs represents the velocity (v)of the object as a function of the time (t)? The positive direction is taken to be upward.
A)I
B)II
C)III
D)IV
E)V

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Multiple Choice

Q 90Q 90

This graph shows the velocity of a particle as a function of time.During what interval is its displacement negative?
A)0 - 2 s
B)2s - 5 s
C)5 s - 9 s
D)0 - 9 s
E)Its displacement is not negative between 0 and 9 s.

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Multiple Choice