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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

Acceleration of centre of mass of system comprising A and B just after A is released is

A

0

B

`3 g//2`

C

3g

D

None of these

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