Question

A body of mass m is placed on the earth's surface. It is taken from the earth's surface to a height h=3R. The change in gravitational energy of the body is

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

$△U=\frac{mgh}{1+\frac{h}{R}}=\frac{mg\times 3R}{1+\frac{3R}{R}}=\frac{3}{4}mgR$