Question 1

FIGURE 2-6 
-Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average velocity of the particle between t = 2 s and t = 4 s?

Accepted Answer

The answer of FIGURE 2-6 
-Fig. 2-6 represents the position...

Question 2

The position of a particle as a function of time is given by x(t) = (3.5 m/s)t - (5.0 m/s²)t². What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

Accepted Answer

The answer of The position of a particle as a...

Question 3

FIGURE 2-6 
-Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average speed of the particle between t = 0 s and t = 3 s?

Accepted Answer

The answer of FIGURE 2-6 
-Fig. 2-6 represents the position...

Question 4

A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.
A)Both its velocity and its acceleration point upward.
B)Its velocity points upward and its acceleration points downward.
C)Its velocity points downward and its acceleration points upward.
D)Both its velocity and its acceleration point downward.
E)Neither velocity nor acceleration can be determined without additional information.

Accepted Answer

As the ball is coming down, its velocity is directed downward because it is moving towards the ground. The acceleration due to gravity is also directed downward, as gravity always acts towards the center of the Earth.

Question 5

FIGURE 2-6 
-Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the magnitude of the instantaneous velocity of the particle when t = 1 s?

Accepted Answer

The answer of FIGURE 2-6 
-Fig. 2-6 represents the position...

Question 6

If a car accelerates at 4.0 m/s², how long will it take to reach a speed of 80 km/hr, starting from rest?

Accepted Answer

The answer of If a car accelerates at 4.0 m/s²,...

Question 7

Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation
A)increases.
B)decreases.
C)stays constant.
D)increases at first, but then stays constant.
E)decreases at first, but then stays constant.

Accepted Answer

The answer of Two objects are dropped from a bridge,...

Question 8

Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts by Arthur's side at the same time and runs back and forth between them at 5.0 m/s. By the time Arthur and Betty meet, what distance has Spot run?

Accepted Answer

The answer of Arthur and Betty start walking toward each...

Question 9

A stone is thrown straight up. When it reaches its highest point,
A)both its velocity and its acceleration are zero.
B)its velocity is zero and its acceleration is not zero.
C)its velocity is not zero and its acceleration is zero.
D)neither its velocity nor its acceleration is zero.
E)neither velocity nor acceleration can be determined without additional information.

Accepted Answer

When the stone reaches its highest point, its velocity is zero because it briefly comes to a stop before starting to fall back down. However, its acceleration is not zero because gravity is still acting on it, causing it to accelerate downwards.

Question 10

The area under a curve in a velocity versus time graph gives
A)distance traveled.
B)displacement.
C)speed.
D)velocity.
E)acceleration.

Accepted Answer

The answer of The area under a curve in a...

Question 11

Which of the following graphs could possibly represent the motion as a function of time of an object in free fall?
A)

B)

C)

D)

E)

Accepted Answer

The answer of Which of the following graphs could possibly...

Question 12

FIGURE 2-6 
-Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average speed of the particle between t = 2 s and t = 4 s?

Accepted Answer

The answer of FIGURE 2-6 
-Fig. 2-6 represents the position...

Question 13

FIGURE 2-6 
-Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average velocity of the particle between t = 0 s and t = 3 s?

Accepted Answer

The answer of FIGURE 2-6 
-Fig. 2-6 represents the position...

Question 14

Two objects are dropped from a bridge, an interval of 1.0 s apart. As time progresses, the difference in their speeds
A)increases.
B)remains constant.
C)decreases.
D)increases at first, but then stays constant.
E)decreases at first, but then stays constant.

Accepted Answer

Both objects are in free fall and experience the same acceleration due to gravity, so the difference in their speeds remains constant.

Question 15

Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. Their dog, Spot, starts from Arthur's side at the same time and runs back and forth between them. By the time Arthur and Betty meet, what is Spot's displacement?

Accepted Answer

The answer of Arthur and Betty start walking toward each...

Question 16

Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.
A)Both its velocity and its acceleration point upward.
B)Its velocity points upward and its acceleration points downward.
C)Its velocity points downward and its acceleration points upward.
D)Both its velocity and its acceleration points downward.
E)Neither velocity nor acceleration can be determined without additional information.

Accepted Answer

As the ball is going up, its velocity is in the upward direction (since it is being thrown up). However, gravity is constantly pulling down on the ball, so its acceleration is in the downward direction.

Question 17

Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A)The one thrown up is traveling faster.
B)The one thrown down is traveling faster.
C)They are traveling at the same speed.
D)It is impossible to tell because the height of the building is not given.
E)It is impossible to tell because a numerical value for the initial speed is not given.

Accepted Answer

Both objects will have the same speed when they hit the street because they both start with the same initial speed and are subject to the same gravitational acceleration, regardless of the direction of the initial throw.

Question 18

A certain car can accelerate from 0 to 100 km/hr in 6.0 seconds. What is the average acceleration of that car in m/s²?

Accepted Answer

The answer of A certain car can accelerate from 0...

Question 19

Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?

Accepted Answer

The answer of Arthur and Betty start walking toward each...

Question 20

Which graph below could represent the motion of the object described in the following sentences? The object that starts its motion with a constant velocity of 2.0 m/s east. After 3.0 s, the object stops for 1.0 s. The object then moves toward the west a distance of 2.0 m in 3.0 s. The object continues traveling in the same direction, but increases its speed by 1.0 m/s for the next 2.0 s.
A)

B)

C)

D)

E)None of the above graphs could represent the motion described.

Accepted Answer

The answer of Which graph below could represent the motion...

Quiz 2: Describing Motion: Kinematics in One Dimension

FIGURE 2-6 -Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average velocity of the particle between t = 2 s and t = 4 s?

The position of a particle as a function of time is given by x(t) = (3.5 m/s)t - (5.0 m/s2)t2. What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

FIGURE 2-6 -Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average speed of the particle between t = 0 s and t = 3 s?

A ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is coming down.

FIGURE 2-6 -Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the magnitude of the instantaneous velocity of the particle when t = 1 s?

If a car accelerates at 4.0 m/s2, how long will it take to reach a speed of 80 km/hr, starting from rest?

Two objects are dropped from a bridge, an interval of 1.0 s apart. During the time that both objects continue to fall, their separation

A stone is thrown straight up. When it reaches its highest point,

The area under a curve in a velocity versus time graph gives

Which of the following graphs could possibly represent the motion as a function of time of an object in free fall?

FIGURE 2-6 -Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average speed of the particle between t = 2 s and t = 4 s?

FIGURE 2-6 -Fig. 2-6 represents the position of a particle as it travels along the x-axis. What is the average velocity of the particle between t = 0 s and t = 3 s?

Two objects are dropped from a bridge, an interval of 1.0 s apart. As time progresses, the difference in their speeds

Suppose a ball is thrown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going up.

Two objects are thrown from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?

A certain car can accelerate from 0 to 100 km/hr in 6.0 seconds. What is the average acceleration of that car in m/s2?

Arthur and Betty start walking toward each other when they are 100 m apart. Arthur has a speed of 3.0 m/s and Betty has a speed of 2.0 m/s. How long does it take for them to meet?

The position of a particle as a function of time is given by x(t) = (3.5 m/s)t - (5.0 m/s²)t². What is the average velocity of the particle between t = 0.30 s and t = 0.40 s?

If a car accelerates at 4.0 m/s², how long will it take to reach a speed of 80 km/hr, starting from rest?

A certain car can accelerate from 0 to 100 km/hr in 6.0 seconds. What is the average acceleration of that car in m/s²?