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A railroad freight car, mass 15 000 kg, is allowed to coast along a level track...

A railroad freight car, mass 15 000 kg, is allowed to coast along a level track at a speed of 3.0 m/s. It collides and couples with a 54 000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15 000-kg car is preserved in the two-coupled cars after collision?

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A. 14% B. 18% C. 78% D. 22% E. 38%

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