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An earth satellite of mass m revolves in a circular orbit at a height h from the surface of the earth. R is the radius of the earth and g is acceleration due to gravity at the surface of the earth. The velocity of the satellite in the orbit is given by

(a)   gR2/R+h                                           (b)  gR

(c)   gR/R+h                                     (d) √gR2/R+h

Answer: d

(7)

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