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A system consists of block A and B each ...

A system consists of block A and B each of mass m connected by a light spring as shown in the figure with block B in contact with a wall. The block A compresses the spring by 3mg/k from natural length of spring and then released from rest. Neglect friction anywhere.
Velocity of centre of mass of system comprising A and B when block B just loses contact with the wall

A

`sqrt(m/K`

B

`(3g)/2sqrt(m/k`

C

`2gsqrt(m/k)`

D

None of these

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