Q: A body of mass m is placed on the earth surface is taken to a height of h = 3R m then, change in gravitational potential energy is

(a) $ \displaystyle \frac{m g R}{3} $

(b) $ \displaystyle \frac{3 m g R}{5} $

(c) $ \displaystyle \frac{3 m g R}{4} $

(d) $ \displaystyle \sqrt{3 m g R} $

Ans: (c)