Question

A particle is acted upon by a constant power. Then, which of the following physical quantity remains constant ?

• A. speed
• B. rate of change of acceleration
• C. kinetic energy
• D. rate of change of kinetic energy

Answer 1

Answer: (D)

We have
Power $=$ Rate of doing work $=\frac{dW}{dt}$
or, $P=\frac{dW}{dt}=$ rate of change in $KE$
i.e., $P=\frac{dW}{dt}=\frac{d(KE)}{dt}=$ constant