Question

A man weighing 60 kg climbs up 45 steps stair case of a building in 9 seconds. If height of each step is 10 cm, then how much power the man has employed?
$Takeg=10m/s^2$

• A. $300W$
• B. $250W$
• C. $500W$
• D. $450W$

Answer 1

The correct option is A $300W$

$Power=\frac{Work}{Time}=\frac{mgh}{t}=\frac{60\times 10\times \frac{450}{100}}{9}P=\frac{45\times 60}{9}=300W$