Question
A planet having mass $9 \mathrm{Me}$ and radius $4 \mathrm{R}_{\mathrm{e}}$, where $\mathrm{Me}$ and $\mathrm{Re}$ are mass and radius of earth respectively, has escape velocity in $\mathrm{km} / \mathrm{s}$ given by:
(Given escape velocity on earth $\mathrm{V}_{\mathrm{e}}=11.2 \times 10^{3} \mathrm{~m} / \mathrm{s}$ )