Q .     A particle of mass m is thrown upwards from the surface of the earth, with a velocity `u`. The mass and the radius of the earth are, respectively, `M` and `R`. `G` is gravitational constant and `g` is acceleration due to gravity on the surface of the earth. The minimum value of `u` so that the particle does not return back to earth is

AIPMT 2011
A

`\sqrt{\frac{2GM}{R}}`

B

`\sqrt{\frac{2GM}{R^{2}}}`

C

`\sqrt{2gR^{2}}`

D

` \sqrt{\frac{2GM}{R^{2}}}`

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