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Power

A man can lif...

Question

A man can lift a block of mass of 50 kg up to a height of 2 m in 2 seconds. Calculate the power developed by the man to lift the block.

10,000 W

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1000 W

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500 W

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45 W

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25 W

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Solution

The correct option is C 500 W
Given : $m = 50$ kg $h = 2$ m $t = 2$ s
Work done in lifting a block $W = m g h = 50 \times 10 \times 2 = 1000$ J
Power developed $P = \frac{W}{t} = \frac{1000}{2} = 500$ W

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