Solid spherical ball is rolling on a frictionless horizontal plane surface about its axis of sym...

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Solid spherical ball is rolling on a frictionless horizontal plane surface about its axis of symmetry. The ratio of rotational kinetic energy of the ball to its total kinetic energy is :
(a) \( 2 / 5 \)
(b) \( 2 / 7 \)
(c) \( 1 / 5 \)
(d) \( 7 / 10 \)
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