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A block of mass M hanging over a smooth ...

A block of mass M hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force F. The kinetic of the block increases by `40J` in `1s`. State whether the following statements are true or false.
(a) The tension in the string is `Mg` .
(b) The work done the tension on the block is `40J`.
(c) the tension in the string is `F`.
(d) The work done by the force of gravity is 40J in the above 1s .

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

Text Solution

Verified by Experts

The correct Answer is:
B
Work done by tension in the string + work done by force of gravity is equal to change in kinetic energy of the block. As the velocity is changing, so F = tension in the string is not equal to mg.
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