On a train moving along east with a constant speed \( v \), a boy revolves a bob with string of ...

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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 a train, with equal constant speed \( v \) relative to train. Mark the correct option(s).
(1) Maximum speed of bob is \( 2 v \) in ground frame.
(2) Tension in string connecting bob is \( 4 m v^{2} / l \) at any instant.
(3) Tension in string is \( m v^{2} / l \) at all the moments.
(4) Minimum speed of bob is zero in ground frame.
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