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  4. A man M1 of mass 80 kg runs up a staircase in 15 s. Another man M2 also of mass 80 kg runs up the same staircase in 20 s. The ratio of the powers developed by them will be

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

Work, Energy and Power

Solution:

Power $P=\frac{\text { Work }}{\text { Time }}$
Work done by both will be same.
Hence, $\frac{P_{1}}{P_{2}}=\frac{t_{2}}{t_{1}}=\frac{20}{15}=\frac{4}{3}$