Question

A man of mass $62\text{kg}$ jumps up a staircase of $65$ steps in $12\text{s}.$ If the height of each step is $20\text{cm}$. Find his power.

Take $g=10{\text{m/s}}^2$

• A. $572\text{W}$
• B. $672\text{W}$
• C. $772\text{W}$
• D. $872\text{W}$

Answer 1

The correct option is B $672\text{W}$

Power of the man,

$P=\frac{W}{t}=\frac{mgh}{t}$

$\Rightarrow P=\frac{62\times 10\times (65\times 0.20)}{12}$

$\Rightarrow P\approx 672\text{W}$

​​​​​​​Hence, option $\left(B\right)$ is the correct answer.