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

A body of mass m is placed on earth surface which is taken from earth'

1.	A body of mass m is placed on earth surface which is taken from earth's surface to a height of h = 3R, then changein gravitational potential energy is :
Answer» `(1)/(4)` MG R `(3)/(4)` mg R `(2)/(3)` mg R `(1)/(2)` mg R. Solution :When a body is taken to a height n times the radius of earth from the surface of earth then change in potential energy `=(n)/(n+1)mgR`. `therefore DeltaU=(3)/(3+1)mgR rArr DeltaU=(3)/(4)mgR`. Thus correct CHOICE is (B).

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

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