Four similar particles of mass m are orbiting in a circle of
radius r in the same angular direction because of their mutual
gravitational attractive force. Velocity of a particle is given by
(a) [GM/r(1+2√2/4)]¹/ ²
(b) 3√GM/r
(c) √GM/r(1+2√2)
(d) [1/2 GM/r (1+√2/2)]¹/ ²
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