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10. A block of mass M is hanging over a smooth and lightpulley through a light string. The other end of the stringis pulled by a constant force F. The kinetic energy ofthe block increases by 20 J in 1 s.(a) The tension in the string is Mg.(b) The tension in the string is F.(c) The work done by the tension on the block is 20in the above 1 s.id) The work done by the force of gravity is -20 J in theabove 1 s.

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