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Question

A boy weighing 50kg climbs up a vertical height of 100m. Calculate the amount of work done by him. How much potential energy does he gain (g=9.8m/s2)

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Solution

Given,
mass of boy = m = 50 kg
height = h = 100m
since boy does not move anything with his force, work done by him is zero
work done on the boy = gain in potential energy
P.E=mgh
P.E=50×9.8×100
P.E=49KJ
so, potential energy gained by boy is 49 KJ

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