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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))(2sqrt2 + 1)`

B

`sqrt((Gm)/(r))`

C

`sqrt((Gm)/(r)((2sqrt2 + 1)/(4)))`

D

`sqrt((2sqrt2Gm)/(r))`

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