A uniform sphere of mass 500 g rolls without slipping on a plane horizontal surface with its centre moving at a speed of 5.00 cm s - 1 . Its kinetic energy is:

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K . E of the sphere = Translational K . E + Rotational K . E = 1 2 m v 2 1 + K 2 R 2 , K = Radius of gyration = 1 2 × 1 2 × 2 100 2 1 + 2 5 = 35 4 × 10 - 4 J = 8.75 × 10 - 4 J

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