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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

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

B

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

C

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

D

None of these

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