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

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A man has power of

$90\ W$ and mass

$60\ kg$ runs up a staircase in

$40\ second$ . If each step of staircase is

$20\ cm$ high, calculate the number of steps. (Take

$g\ =\ 10\ ms^{–2}$ ).

$6$
$30$
$60$
$45$

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