a 3 kg model train going right at 2.8 m/s bumps into another 2 kg model train car moving in the same direction at 1.6 m/s. the heavier train car has a final speed of 2.2 m/s to the right. find the final speed of the lighter train car. state the law of conservation of momentum.
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a 3 kg model train going right at 2.8 m/s bumps into another 2 kg model train car moving in the same...
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