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Four particle each of mass m are undergo...

Four particle each of mass m are undergoing circular motion under the influence of action of their mutual gravitationa interaction while being at the vertices of a square of side a.Their speeds are.
(A) `sqrt(2Gm)/a` (B) `1.16sqrt(Gm)/a` (C) `1.5sqrt(Gm)/a` (D) `sqrt(Gm)/a`

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