Question

A boy of mass 50 kg runs up a staircase of 45 steps in 9 sec.If the height of each steps is 15 cm.Find his power.(Take g=10 $m{s}^{-2}$)

• A. 275 W
• B. 350 W
• C. 325 W
• D. 375 W

Answer 1

Answer: (D)

375 W

Given,

$m=50kg$

$h=45\times 15cm=6.75m$

$t=9sec$

$g=10m/s^2$

Power, $P=\frac{mgh}{t}$

$P=\frac{50\times 10\times 6.75}{9}=375W$

The correct option is D.