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A block of mass M is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. If kinetic energy of the block increases by 20 J in 1s. Then

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Work done by the tension on the block is 20 J in 1 sec.

Work done by the force of gravity is 20 J in 1 sec.

tension in the string is F

tension in the string is Mg.

answer is B.

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Detailed Solution

Since the string is light ,tension induced in the string is F.

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