A particle of mass m is thrown upwards f...

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

`sqrt(2GM/R^2)`

`sqrt(2GM/R)`

`sqrt(2gM/R)`

`sqrt(2gR^2)`

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