A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy ( K t ) as well as rotational kinetic energy ( K r ) simultaneously. The ratio K t : (K t + K r) for the sphere is

1. A. 10 : 7
2. B. 5 : 7
3. C. 7 : 10
4. D. 2 : 5

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