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A force of 49 N acts tangentially at the highest point of a sphere (solid) of mass 20 kg, kept on a rough horizontal plane. If the sphere rolls without slipping, then the acceleration of the center of the sphere is

1. 2.5 m/s 2
2. 0.25 m/s 2
3. 3.5 m/s 2
4. 0.35 m/s 2

Correct answer: 3.5 m/s 2

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