Physics

Problem

A planet has an escape speed of

11\,\text{km s}^{-1}

and the acceleration due to gravity at its surface is

12\,\text{m s}^{-2}

. The radius of the planet is a)

1.0\times10^{7}\,\text{m}

2.5\times10^{6}\,\text{m}

5.0\times10^{6}\,\text{m}

6.2\times10^{6}\,\text{m}