A boy of weight 500 N climb up a rope through a height of 10 m in 20 seconds. Calculate the power expended by him.

100 W

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200 W

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250 W

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300 W

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Solution

The correct option is C 250 W
Weight of the boy, mg = 500 N
Displacement (height), h = 10 m
Time taken, t = 20 s
Power, P = $\frac{W o r k d o n e}{t i m e t a k e n}$
$= \frac{m g h}{t} = \frac{500 \times 10}{20} = 250 W$

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