A weightlifter is lifting weights of mass $200 k g$ up to a height of $2$ meters. If $g = 9.8 m / s^{2},$ calculate :
a) potential energy acquired by the weight
b) Work done by the weightlifter

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Solution

Mass , $m = 200 k g$
Height , $h = 2 m$
Acceleration due to gravity , $g = 9.8 m / s^{2}$
a) Potential energy $= m g h = 3920 J$

b) Work done against gravity = potential energy gained by the weight
Therefore , work done , $W = m g h = 3920 J$

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