A boy weighing $50 k g$ climbs up a vertical height of $100 m$ . Calculate the amount of work done by him. How much potential energy does he gain ( $g = 9.8 m / s^{2}$ )

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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
$P . E = m g h$
$P . E = 50 \times 9.8 \times 100$
$P . E = 49 K J$
so, potential energy gained by boy is 49 KJ

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