3. A toy railroad engine having a mass of 1.5 kg and moving on a straight track at 0.20 m/s collides with a similar engine ahead of it moving in the same direction at 0.12 m/s. On colliding, the engines lock and remain together. (a) What is the momentum of each engine before the collision? (b) What is the magnitude and direction of the momentum of both engines after the collision? (c) What is the velocity of the pair of engines after the collision?

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