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A boy weighing $50\ kg$ climbs up a vertical height of $100\ m$. Calculate the amount of work done by him. How much potential energy does he gain?$(g=9.8\ m/s^2)$.
Mass of the boy $m=50\ kg$
Vertical height $h=100\ m$
Gravitational acceleration $g=9.8\ m/s^2$
Therefore, potential energy $P=mgh$
$=50\times100\times9.8$
$=4.9\times10^3\ J$
Therefore, the boy gained $4.9\itmes 10^3\ J$ potential energy.
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