A satellite of mass m revolves around the earth of radius R at a height x from its surface. If g is the acceleration due to gravity on the surface of the earth, the orbital speed of the satallite is

Options

(a) gx
(b) gR/R-x
(c) gR²/R+x
(d) {gR²/R+x}½

Correct Answer:

{gR²/R+x}½

Explanation:

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