Potential energy in circular orbits

Two particles of identical mass are moving in circular orbits under a potential given by V(r)=KrnV(r) = Kr^{-n} , where KK is a constant.

If the radii of their orbits are r1,r2r_1,r_2 and their speeds are v1,v2v_1, v_2, respectively, then which of the following equations must be true?


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