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

Options

A. gx
B. `(gR)/(R -x)`
C. `(gR^2)/(R + x)`
D. `((gR^2)/(R + x))^(1//2)`

Answer

D

Explanation

`((gR^2)/(R + x))^(1//2)`