Question

A body of mass m is placed on earth's surface which is taken from earth surface to a height of h = 3R, then change in gravitational potential energy is

(a) mgR/4

(b) 2/3 mgR

(c) 3/4 mgR

(d) mgR/2

Answer 1

Correct option c) 3/4 mgR

Explanation:

Gravitational potential energy on earth's surface = GMm/R, where M and R are the mass and radius of the earth respectively, m is the mass of the body and G is the universal gravitational constant. 

Gravitational potential energy at a height h = 3 R