Question

A boy, whose weight is $600N$ runs up a flight of stairs, $10m$ high, in a time of $12s$. What is the average power developed by boy in $watts$?

• A. $72$
• B. $500$
• C. $720$
• D. $5000$

Answer 1

Answer: (B)

$500$

$W=600N$
$Power=\frac{Workdone}{t}$

$\Rightarrow Power=\frac{mgh}{t}=\frac{Wh}{t}=\frac{600\times 10}{12}=500W$