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A hoop of radius r and mass m rotating with an angular velocity ω 0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will bet he velocity of the centre of the hoop when it ceases to slip ?

1. 2 r 0 ω
2. r ω 0
3. 4 r 0 ω
4. 3 r 0 ω

Correct answer: 2 r 0 ω

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