Four particles each of mass M, move alon...

Four particles each of mass M, move along a circle of radius R under the action of their mutual gravitational attraction as shown in figure. The speed of each particle is :

A

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

B

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

C

`sqrt(GM)/R`

D

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

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