On a train moving along east with a constant speed v, a boy revolves a bob with string of length $l$ on smooth surface of the train, with same constant speed v relative to train. Mark the correct option (s).

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Maximum speed of the bob is 2v in ground frame.

Tension in the string connecting the bob is $\frac{4 m v^{2}}{l}$ at an instant shown

Tension in the string is $\frac{m v^{2}}{l}$ at all the moments

Minimum speed of bob is zero in ground frame.

answer is A, C, D.

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Detailed Solution

When particle passes through point 2 shown speed is zero and speed is maximum when particle passes through point 4. Frame of trolley in identical and continuously in trolley frame particle is performing uniform circular motion. $T = \frac{m v^{2}}{l};$ at all the position.

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