Physics, so confused

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A cart of mass M1 = 5.00 kg and initial speed = 3.00 m/s collides head on with a second cart of mass M2 = 3.00 kg at rest. Assuming that the collision is elastic, find the speed of M2 after the collision.

I am not sure how to find this answer without having a V2 for the first cart. Please help me!!

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