In the figure m(A) = m(B) = 1 kg. Block ...

In the figure `m_(A) = m_(B) = 1 kg`. Block A is neutral while `q_(B) = -1C`. Sizes of A and B are negligible. B is released from rest at a distance 1.8 m fromt A. Initially spring is neither compressed nor elongated.

If collision between A and B is perfectly inelastic, what is velocity of combined mass just after collision ?

6 m/s

3 m/s

9 m/s

12 m/s

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