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A satellite of mass revolves around the ...

A satellite of mass 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 satelite is

A

gx

B

`gR/(R-x)`

C

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

D

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

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