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Two identical freight cars roll without friction towards each other on a level track one rolls at 2 m s and the other rolls at 1 m s after the cars collide they couple and roll together with a speed?

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Q: Two identical freight cars roll without friction towards each other on a level track one rolls at 2 m s and the other rolls at 1 m s after the cars collide they couple and roll together with a speed?
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