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 ) (1+2sqrt(2)))`
B
`1/2sqrt((GM)/(R ) (1+2sqrt(2)))`
C
`sqrt((GM)/(R ))`
D
`sqrt(2sqrt(2)(GM)/(R ))`
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