A man does a given amount of work in $ 10 sec.$ Another man does the same amount of work in $20 sec.$ The ratio of the output power of first man to the second man is
A man does a given amount of work in $ 10 sec.$ Another man does the same amount of work in $20 sec.$ The ratio of the output power of first man to the second man is
$1$
$0.5$
$2$
None of these
A man does a given amount of work in $ 10 sec.$ Another man does the same amount of work in $20 sec.$ The ratio of the output power of first man to the second man is
${\rm{Power}} = \frac{W}{t}.$ If W is constant then $P \propto \frac{1}{t}$
i.e. $\frac{{{P_1}}}{{{P_2}}} = \frac{{{t_2}}}{{{t_1}}} = \frac{{20}}{{10}} = \frac{2}{1}$