Multiple choice question II — task. Science CBSE, Class 9.

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A boy of mass

$40\ kg$ runs up a staircase of

$40$ steps in

$10\ s$ . If the height of each step is

$25\ cm$ , what is the power of the boy? (Take

$g\ =\ 10\ ms^{–2}$ ).

$100\ W$
$200\ W$
$400\ W$
$800\ W$

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