Power

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Question

A man $M_{1} of mass 80 kg runs up a staricase in 15 s . Another man M_{2}$ also of mass 80 kg runs up the same staircase in 20 s. The ratio of the power developed by them will be:

Easy

Solution

Power: P = work/time
Work done by both will be same. Hence
$\frac{P_{1}}{P_{2}} = \frac{t_{2}}{t_{1}} = \frac{20}{15} = \frac{4}{3}$

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