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A 20-Mg railroad car moving at 4 km/h is to be cou

A 20-Mg railroad car moving at 4 km/h is to be coupled to a 40-Mg car which is at rest with locked wheels (mk 5 0.30). Determine (a) the velocity of both cars after the coupling is completed, (b) the time it takes for both cars to come to rest

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