Two model train cars roll to the right. Both have masses of 1Kg. One has a velocity of 2m/s. It

Two model train cars roll to the right. Both have masses of 1Kg. One has a velocity of 2m/s. It catches up with and couples to the other which had a velocity of 1m/s. What is the velocity of the combined mass?

m1 v1i + m2 v2i = m1 v1f + m2 v2

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