[" Q."10" Three point masses,"M" each,are moving in a circle,each with a speed "v" ,under their mutual "],[" gravitational attractive force.The distance between any two masses must be: "],[[" (A) "2GM/v^(2)," (B) "3GM/v^(2)," (C) "GM sqrt(3)/v^(2)," (D) "GM/v^(2)]]