A particle is kept at rest at a distance $'R'$ from the surface of earth (of radius $R$). The minimum speed with which it should be projected so that it does not return is
A particle is kept at rest at a distance $'R'$ from the surface of earth (of radius $R$). The minimum speed with which it should be projected so that it does not return is
- A
$\sqrt {\frac{{GM}}{{4R}}} $
- B
$\sqrt {\frac{{GM}}{{2R}}} $
- C
$\sqrt {\frac{{GM}}{{R}}} $
- D
$\sqrt {\frac{{2GM}}{{R}}} $
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