$A$ body of mass $m$ is lifted up from the surface of the earth to a height three times the radius of the earth. The change in potential energy of the body is (where $g$ is acceleration due to gravity at the surface of the earth).
- A$3mgR$
- B$\frac{3}{4} mgR$
- C$\frac{1}{3} mgR$
- D$\frac{2}{3} mgR$
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