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A railroad freight car, mass 15,000 kg, is allowed to coast along a level track at a speed of 2.0m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakesreleased. What is the speed of the two cars after coupling?A) 0.46 m/sB) 0.60 m/sC) 1.2 m/sD) 1.8 m/s
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