A \(70 kg\) man ascends a flight of stairs of height \(4 m\) in \(7 s\), The power expended by the man is ____________
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Correct Answer: Option D
Explanation:
Given: \(M=70 kg , h=4 m , t=7 s\)
\begin{aligned}
\text { Power } &=\frac{\text { energy }}{\text { time }}=\frac{m g h}{t} \\
&=\frac{70 \times 4 \times 10}{7}=400 W
\end{aligned}
Given: \(M=70 kg , h=4 m , t=7 s\)
\begin{aligned}
\text { Power } &=\frac{\text { energy }}{\text { time }}=\frac{m g h}{t} \\
&=\frac{70 \times 4 \times 10}{7}=400 W
\end{aligned}