A man $M_{1}$ 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

Q. A boy of mass

50 k g

runs up to a stair case of

45

steps in

9 s

. If the height of a

15 c m

, find his power.

(g = 10 {m / s}^{2})

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A man M1 of mass 80 kg. runs up a stair case in 15 s. Another man M2 also of mass 80 kg. runs up the same stair case in 20 s. The ratio of the power developed by them will be-

The correct option is B 4/3P1P2=t2t1 since work done by both is same.∴P1P2=2015=43

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

The correct option is B $4 / 3$
$\frac{P_{1}}{P_{2}} = \frac{t_{2}}{t_{1}}$ since work done by both is same.
$∴ \frac{P_{1}}{P_{2}} = \frac{20}{15} = \frac{4}{3}$