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A uniform thin ring of mass 0.4 kg rolls without slipping on a horizontal surface with a linear velocity of 10 cm/s. The kinetic energy of the ring is :

1. 4 × 10 – 3 joules
2. 4 × 10 – 2 joules
3. 2 × 10 – 3 joules
4. 2 × 10 – 2 joules

Correct answer: 4 × 10 – 3 joules

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