Question

(a) A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same ?

(b) Can a body possess energy even when it is not in motion ? Explain your answer with an example

Answer 1

(a) When a cyclist doubles his speed. His kinetic energy increases four times: $KE=\frac{1}{2}\times m\times v^2$

(b) Yes, a body possesses energy even when it is not in motion; Consider a body raised to a certain he ight say h. It its velocity is zero.
Kinetic energy will be zero but the body will have. P.E. = mgh.
Thus, a body may possess energy even though it is not in motion.