A boy, whose weight is $600 N$ runs up a flight of stairs, $10 m$ high, in a time of $12 s$ . What is the average power developed by boy in $w a t t s$ ?

72

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500

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720

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5000

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Solution

The correct option is C $500$
$W = 600 N$
$P o w e r = \frac{W o r k d o n e}{t}$
$\Rightarrow P o w e r = \frac{m g h}{t} = \frac{W h}{t} = \frac{600 \times 10}{12} = 500 W$

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