A railroad freight car mass 15000kg is allowed to coast, Physics

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A railroad freight car mass 15000kg is allowed to coast

A railroad freight car, mass 15000kg, is allowed to coast along a level track at a speed of 2.0m/s. It collides and couples with a 50000kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15000kg car is preserved in the two-coupled cars after collision?

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