Question

The earth is assumed to be sphere of radius R. A platform is arranged at a height R from the surface of Earth. The escape velocity of a body from this platform is kv, where v is its escape velocity from the surface of the earth. The value of k is(a) $\frac{1}{\sqrt{2}}$(b) $\frac{1}{3}$(c) $\frac{1}{2}$(d) $\sqrt{2}$

Answer 1

This is helpful for this question.

Answer 2

Answer:

1/root 2

Explanation: