# The kinetic energy needed to project a body of mass m from the earth surface (radius R) to infinity is

The kinetic energy needed to project a body of mass m from the earth surface (radius R) to infinity is

(a) mgR/2

(b) 2mgR

(c) mgR

(d) mgR/4

Ve=$$\sqrt{2gR}$$      _______ Formula of Escape velocity
... Kinetic Energy =
$${{1\over2}mv_e^2= {1\over2}m\times2gR }$$
$$mgR$$