A train car traveling east at 2 m/s collides with two stationary train cars parked next to each other so that they touch but are not coupled. In the collision, the incoming car engages the train coupler on the car that it hits. With what speeds are the cars moving after the collision? Cars 1&2 have the same mass of 10,000 kg, while car 3 has a mass of 20,000 kg.

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