## Quiz 2 :

Kinematics: Description of Motion

Answer:

Write the expression for the total volume of the saline.

The time it takes for the saline to be finished is equal to the total volume of the saline divided by the rate of its injection,

Here

is the rate of injection of the saline.

Substitute

for

and

for

,

Therefore, it takes about two hours for the half liter saline to run out.

Answer:

A physical quantity which have only magnitude is called as scalar quantity and have both magnitude and direction is known as vector quantity. Here, magnitude is defined as the size or quantity, whereas the direction is referred as a vector, which is directed from one place to another.

A vector has both magnitude and direction, the then option (c) is incorrect.

A scalar quantity has only magnitude but no specified direction. Hence, the option (b) is also incorrect.

Therefore, the correct answer is

.

Answer:

Distance traveled by an object is the change in its position whereas displacement is shortest path traced by the object.

Measuring the shortest path is the displacement, so its magnitude will always be equal to or smaller than the distance.

If the displacement of the object is 300 m north, then the distance of the object may be greater or equal to the displacement.

Suppose, if the object traces a straight line path towards north, then the distance will also be 300 m. But, if the same object moves in different paths and finally reaches north, then the distance of the object will be greater than the displacement.