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I'm an 8th student who has never doen a comparative essay before. I have to compare the lebanese civil war of 1975 from the fictional book I read about it and the research i did about it. The problem is they're the same.

A 10,000 kg railroad car traveling at a speed of 24.0 m/s strikes an identical car at rest. If the cars lock together as a result of the collision, what is their common speed afterward?