A crane lifts a mass of $100 k g$ to a height of $10 m$ in $20 s$ . The power of the crane is (Take $g = 10 m s^{- 2})$ .

100 W

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200 W

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250 W

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500 W

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Solution

The correct option is D $500 W$
Power of crane $= \frac{w o r k d o n e}{t i m e t a k e n}$
$= \frac{m g h}{t i m e t a k e n} = \frac{100 \times 10 \times 10}{20}$
$= 500 W$

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