Four particles, each of mass M and equid...

Four particles, each of mass M and equidistant from each other, move along a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is

A

`sqrt(GM/R)`

B

`sqrt((2sqrt2) GM/R)`

C

`sqrt(GM/R (1+2sqrt2))`

D

`1/2 sqrt(GM/R(1+2sqrt2))`

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