Conservation of momentum

A 20g bullet pierce through a plate of mass m1= 1kg and then comes to rest inside a second plate of mass m2= 2.98kg. It is found that two plates initially at rest, now moves with equal velocities. Find the percentage loss in the initial velocity of the bullet when it is moving between m1 and m2. Neglect any loss of material of the plates due to the action of bullet.

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