A boat having a length of $3\,metre$ and breadth $2\,metre$ is floating on a lake. The boat sinks by one cm when a man gets on it. Mass of the man is ....... $kg$
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$\mathrm{F}_{\mathrm{b}}=\mathrm{mg}$
$\Rightarrow \quad\left(3 \times 2 \times \frac{1}{100}\right) 10^{3} \mathrm{g}=\mathrm{mg}$
$\Rightarrow \quad \mathrm{n}=60 \mathrm{kg}$
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