A coolie raises a box of mass 50 kg to a vertical height of 4 m. Calculate the work done by him if the force of gravity on 1 kg mass is 10 N.

5 J

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25 J

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10 J

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15 J

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Solution

The correct option is D
15 J

Given,mass $m = 50 k g$

Force, $F = m g$

= $50 k g \times 10 N k g^{- 1}$ = 500 N

Now, d = 3 m

Work done = Force $\times$ displacement

= 500 N $\times$ 4 m = 2000 J

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