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A train car that has a mass of 8800 ?? is moving in the +? direction...

A train car that has a mass of 8800 ?? is moving in the +? direction at 23.4 ?? when it strikes another train car that is moving in the – ? direction at 3.4 ?? . The train cars

latch together and move with a speed of 8.16 ?? in the +? direction. What is the mass of the second train car?

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