Question

2.
A body performing uniform circular motion has

(A) constant velocity
(B) constant acceleration
( C) constant kinetic energy
(D) constant displacement​

Answer 1

1. The velocity will not be constant , the speed will be constant .
2. if acceleration will be constant the circular motion will not be uniform .
3. Kinetic energy will be constant .✅
4. Displacement will change at every single point on the circular motion.

Answer 2

A body performing uniform circular motion has (C) constant kinetic energy.

Explanation:

Uniform circular motion:

• When an object moves in a circular track/path with uniform speed, its motion is called uniform circular motion.

• For example - if the athlete moves with a velocity of constant magnitude along the circular path the only change in his velocity is due to the change in the direction of the motion.

• In a Uniform Circular Motion, speed is constant but velocity changes.

Here, A body performing uniform circular motion has constant kinetic energy.

• In a uniform circular motion, velocity is constant in magnitude only.
• Also, kinetic is the product of mass and square of velocity. We know that square of the vector is simply a scalar quantity.
• Hence, kinetic energy does not change with a change in direction.