A weightlifter is lifting weights of mass $200\ kg$ up to a height of $2\ metres$. If $g=9.8\ ms^{-2}$, calculate:(a) potential energy acquired by the weights.(b) work done by the weightlifter.

Here mass $m=200\ kg$

Gravitational acceleration $g=9.8\ m/s^2$

Height $h=2\ m$

Therefore, (a). Potential energy $P=mgh$

$=200\ kg\times9.8\ m/s^2\times 2\ m$

$=3920\ J$

(b). Work done to lift the object $=$potential energy gained against gravity$=3920\ J$

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Updated on: 10-Oct-2022

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