Question

Which of the following is not an example of accelerating motion?

• A. An object attaining a velocity of 10 m/s after starting from rest.
• B. An object under free fall.
• C. An object moving with a constant velocity.
• D. An object moving with a constant speed but changing its direction.

Answer 1

The correct option is C An object moving with a constant velocity.

Acceleration is a vector quantity and is defined as the change in velocity per unit time. A body is in accelerating motion when the speed and/or the direction of motion of the object changes. Let’s see the options:

• An object attaining a velocity of 10 m/s after starting from rest- Obviously, speed changes here.
• During free fall, the body is under acceleration due to gravity.
• If a body has constant velocity, change in velocity is zero, and the body is not accelerating.
• An object moving with a constant speed but changing its direction- Body’s velocity is changing due to change in direction and the body is under acceleration. This is also known as centripetal acceleration.