Motion Test

Result

Motion Test - 1

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Question 1
1 / -0

Let the velocity and acceleration of a body be denoted by v and a, respectively. Which of the following relations holds true?

A
a can be non-zero, when v = 0.

B
a must be zero, when v = 0.

C
a > 0, when v > 0.

D
a < 0, when v > 0.

Solution

Acceleration of a body may be non-zero even if the velocity is zero. For example, if we throw a ball upwards, acceleration due to gravity is acting in the downward direction; at the highest point, the velocity of the ball becomes zero but acceleration is acting downwards.

The object will speed up if the direction of the velocity and that of the acceleration are the same, and will slow down if both are opposite in direction. There is no definite relationship between acceleration and velocity.