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A satellite is moving with an orbital velocity u at a distance R from the surface of the earth. With what velocity should it move, so that it escapes the gravitational pull of the earth. R is the radius of the earth
$u = \sqrt{\frac{2 G M}{R}}$
$u = \sqrt{\frac{G M}{2 R}}$
$u = \sqrt{\frac{G M}{R}}$
$u = 2 \sqrt{\frac{G M}{R}}$

A

u = \sqrt{\frac{G M}{2 R}}

B

u = \sqrt{\frac{2 G M}{R}}

C

u = \sqrt{\frac{G M}{R}}

D

u = 2 \sqrt{\frac{G M}{R}}

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