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 =

$\frac{1}{2}m{v}_e^2=\frac{1}{2}m\times 2gR$

$mgR$

option C is correct