Momentum and CollisionHard

Question

A block of mass 2 kg is suspended from astring, is released from a height of 5m as shown  in figure then what will be the impulse when string. Just becomes tight :-
  

Options

A.2 N-s
B.0.2 N-s
C.20 N-s
D.200 N-s

Solution

m(vf - vi)
2[0 - (- )]
= 20 N-s

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