A hollow sphere and a solid sphere, both having the same mass of 5 kg and radius 10 m are initially at rest. If they are made to roll down the same inclined plane without slipping, the ratio of their speeds when they reach the bottom of the plane
vhollow / vsolid
(A) X 1               (B) 7 10                (C) 7 12                 (D) 21 25

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