Radius of the earth is $R$. If a body is taken to a height $3R$ from the surface of the earth than change in potential energy will be
Radius of the earth is $R$. If a body is taken to a height $3R$ from the surface of the earth than change in potential energy will be
- A
$3mgR$
- B
$\frac {3}{2}\,mgR$
- C
$mgR$
- D
$\frac {3}{4}\,mgR$
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