The gravitational potential at a point above the surface of earth is -5.12 × 10^7 J / kg and the acceleration due to gravity at that point is 6.4 m /…

The gravitational potential at a point above the surface of earth is $\displaystyle -5.12 \times 10^7 \mathrm{~J} / \mathrm{kg}$ and the acceleration due to gravity at that point is $\displaystyle 6.4 \mathrm{~m} / \mathrm{s}^2$. Assume that the mean radius of earth to be $\displaystyle 6400$ km . The height of this point above the earth's surface is :