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A man of mass $60\ kg$ runs up a flight of $30$ steps in $40$ seconds. If each step is 20 cm high, calculate the power of the man.
Here given: mass of thee man $m=60\ kg.$
Number of steps $=30$
Height of each step $=20\ cm$
Total height $h=30\times20$
$600\ m$
Therefore, work done $W=mgh$
$=60\times9.8\times600$
$=3,52,800\ Joule$
Therefore, power of the man used $P=\frac{W}{t}$
$=\frac{3,52,800\ Joule}{40\ seconds}$
$=8820\ Watt$
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