Question

A boy of weight 500 N climb up a rope through a height of 10 m in 20 seconds. Calculate the power expended by him.

• A. 100 W
• B. 200 W
• C. 250 W
• D. 300 W

Answer 1

The correct option is C 250 W

Weight of the boy, mg = 500 N
Displacement (height), h = 10 m
Time taken, t = 20 s
Power, P = $\frac{Workdone}{timetaken}$
$=\frac{mgh}{t}=\frac{500\times 10}{20}=250W$