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What is the kinetic energy of a satellite of mass $m$ in a circular orbit of radius $R$ around a planet of mass $M$?

A

$ \cfrac {GMm}{R} $

B

$ \cfrac {GMm}{R^2} $

C

$ \cfrac {GMm}{2R^2} $

D

$ \cfrac {GMm}{2R} $

E

$\cfrac {GMm}{4R } $

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