Medium
$A$ 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 satellite is:
- A$gx$
- B${\left( {\frac{{gR}}{{R - x}}} \right)^{1/2}}$
- C${\left( {\frac{{gR^2}}{{R + x}}} \right)^{1/2}}$
- D${\left( {\frac{{gR}}{{R + x}}} \right)^{1/2}}$
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