A cube of wood supporting $200\,gm$ mass just floats in water. When the mass is removed, the cube rises by $2\, cm$. ............ $cm$ is the side of cube .
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weight of mass $=$ weight of water displaced
$=\mathrm{V} \times \rho_{\mathrm{w}} \Rightarrow \mathrm{V}=\frac{200}{1}=200 \mathrm{cc}$
$\therefore \quad 2 \times a \times a=200 \Rightarrow a=10 \mathrm{cm}$
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