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1. A 8600kg boxcar is traveling at 12 m/s strikes a second boxcar of mass 7900...

1. A 8600kg boxcar is traveling at 12 m/s strikes a second boxcar of mass 7900 kg moving in the same direction. The two stick together and move off with a speed of 5.25 m/s. What was the original speed of the second boxcar? Explain your reasoning.

2. How much kinetic energy was lost in the collision?

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