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A satellite of mass $m$ is in a circular orbit around a planet (of mass $M$ and radius $R$) at a height of $R$ above the surface of the planet.

What is the kinetic energy of the satellite?

A

$\cfrac {GMm}{8R}$

B

$\cfrac {GMm}{6R}$

C

$\cfrac {GMm}{4R}$

D

$\cfrac {GMm}{2R}$

E

$\cfrac {GMm}{R}$

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