1(vi)
A fast-moving cyclist stops pedalling on reaching a hilly track. If he continues to move with the acquired energy, then assuming no loss of energy:
- (a)his kinetic energy remains constant at all times.
- (b)his potential energy remains constant at all times.
- (c)his total mechanical energy continuously increases.
- (d)his total mechanical energy remains constant.
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his total mechanical energy remains constant.
Reason — When the cyclist stops pedalling and continues moving on a hilly track, his kinetic energy gradually converts into potential energy as he moves upward. If there is no loss of energy, the sum of kinetic and potential energy remains unchanged.
Therefore, the total mechanical energy remains constant during the motion.