A particle of mass m is thrown upwards from the surface

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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

The velocity u should be equal to the escape velocity. That is,
u = √2gR

But g =	GM
	R²

		2GM		^{1 / 2}
		R

		2GM		^{1 / 2}
		R²

		2GM		^{1 / 2}
		R²