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A 10, 000 kg railroad car is rolling on a horizontal railroad track at 1.20 m/s....

A 10, 000 kg railroad car is rolling on a horizontal railroad track at 1.20 m/s. The 10,000 kg car hits an 18,000 kg car, which is initially at rest, and the cars lock together. What is the final velocity of the coupled cars just after they lock together?

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