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7. Two cars are moving at 0 degrees. Car B is behind Car A and they...

7. Two cars are moving at 0 degrees. Car B is behind Car A and they get into an accident. Car B was going too fast and crashed into the back of Car A. If Car A weighs 1200kg and was moving at 20m/s and Car B weighs 1100kg and was moving at 35m/s, how fast were the cars moving after collision?

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