An object is kept at rest at a distance of $3R$ above the earth's surface,where $R$ is the earth's radius. The minimum speed with which it must be projected so that it does not return to earth is (Assume $M =$ mass of earth,$G =$ Universal gravitational constant).
- A$\sqrt{\frac{GM}{2R}}$
- B$\sqrt{\frac{GM}{R}}$
- C$\sqrt{\frac{3GM}{R}}$
- D$\sqrt{\frac{2GM}{R}}$
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