Question: In a railroad switchyard, a 5 6 - ton freight car is sent at 7 . 0 mi / h toward a 3 1 -

In a railroad switchyard, a 56-ton freight car is sent at 7.0 mi/h toward a 31-ton car moving in the same direction at 2.6 mi/h.(a) Whats the speed of the cars after they couple? (b) What fraction of the initial kinetic energy was lost in the collision?

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