Question

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

Answer 1

V_{e=\(\sqrt{2gR}\)      _______ Formula of Escape velocity}

_\(\).^.. Kinetic Energy =

\({{1\over2}mv_e^2= {1\over2}m\times2gR }\)

\(mgR\)

option C is correct