Question

A body moving in a circular path with a constant speed has a ________

• A. constant velocity
• B. constant momentum
• C. constant kinetic energy
• D. constant acceleration

Answer 1

The correct option is C

constant kinetic energy

We can see that direction of velocity and acceleration changes continuously

$\therefore$ Both are not constant.

Momentum is m. $\overrightarrow{v}$ which depends on velocity and changes with velocity.

The only quantity that is constant is speed and kinetic energy is $\frac{1}{2}m|\overrightarrow{v}{|}^2$ where $|\overrightarrow{v}|$ is the speed.

$\therefore$ Answer is kinetic energy.