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A block of mass M is hanging over a smoo...

A block of mass `M` is hanging over a smooth and light pulley by a constant force `F`. The kinetic energy of the 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 20 J in the above 1s

D

The work done by the force of gravity is –20 J in the above 1s

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The correct Answer is:
B
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