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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.

Maximum extension in the spring after system loses contact with wall

A

`(3mg)/(sqrt(2k))`

B

`(sqrt3mg)/(2k)`

C

`(sqrt3mg)/(sqrt2k)`

D

None of these

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