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Potential Energy of an Object at a Height

A man weighin...

Question

A man weighing 50 kg lifts a weight of 30 kg to the top of building 10 m high. Find the work done by him. Take $g = 9.8 m / s^{2}$

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Solution

Total mass, m = 50 kg + 30 kg = 80 kg
Height, h = 10 m
Work done, W = Increase in potential energy
$= m g h$
$= 80 \times 9.8 \times 10$
$= 7840 J$

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