Solution:
After collision the blocks come to rest as moving with equal velocities in opposite directions. So each mass complete half oscillation.
Two blocks each of mass m are connected with springs each of force constant fr as shown in the Fig. Initially the springs are relaxed. The mass A is displaced to the left and ^B to the right by the same amount and released, then the time period of oscillation is:
After collision the blocks come to rest as moving with equal velocities in opposite directions. So each mass complete half oscillation.