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

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

A

ThetensioninthestringisMg.

B

ThetensioninthestringisF.

C

Theworkdonebythetensionontheblockis20Jintheabove1s.

D

Theworkdonebytheforceofgravityis-20Jintheabove1s.

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The correct Answer is:
B
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