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Four identical particles of equal masses 1kg made to move along the circumference of a circle of radius 1m under the action of their own mutual gravitational attraction. The speed of each particle will be:
A) SQRT[(1+2(2)^1/2)G]/2
B) SQRT[G(1+2(2)^1/2)]
C) SQRT[(G/2)(2(2)^1/2)-1]
D) SQRT[(G/2)(1+2(2)^1/2)]

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