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A string is wound around a hollow cylinder of mass 5 kg and radius 0.5m. If the string is now pulled with a horizontal force of 40 N, and the cylinder is rolling without slipping on a horizontal surface (see figure), then the angular acceleration of the cylinder will be (Neglect the mass and thickness of the string) : 40 N

1. 16 rad/s 2
2. 20 rad/s 2
3. 10 rad/s 2
4. 12 rad/s 2

Correct answer: 16 rad/s 2

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