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The potential energy of a system of two planets of mass $M$ each separated by the distance $R$ is

A

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

B

$ -\cfrac {GM^2}{R^2} $

C

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

D

$ -\cfrac {GM^2}{R} $

E

$\text{zero}$.

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