Question

A boy of mass 40 kg climbs up the stairs and
reaches the roof at a height 8 m in 5 s. Calculate :
(i) the force of gravity acting on the boy,
(ii) the work done by him against the force of
gravity,
(iii) the power spent by the boy.
(Take g = 10 ms
s-2)​

Answer 1

Explanation:

Time taken, t = 5s. (ii)While climbing, the boy has to do work against the force of gravity. (iii) Power spent = work done/time taken = 3200/5 = 640 W.

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