$A$ particle of mass $m$ is kept at rest at a height $3R$ from the surface of the Earth,where $R$ is the radius of the Earth and $M$ is the mass of the Earth. The minimum speed with which it should be projected upward so that it does not return back is ($g$ = acceleration due to gravity on the Earth's surface).
- A$[\frac{GM}{2R}]^{1/2}$
- B$[\frac{gR}{4}]^{1/2}$
- C$[\frac{2g}{R}]^{1/2}$
- D$[\frac{GM}{R}]^{1/2}$
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