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D) 0.31 m/s F) None of these 2) A railroad m/s. It releas A) 0.77 m/s B) 1.2 m/s freight car, mass 25,000 ks, is allowed to coast along a level track at a speed of 2.0 What is the speed of the two cars after coupling? des and couples with a 50,000-kg second car, initially at rest and with brakes C) 1.8 m/s D) 3.1 m/s E) 0.46 m/s F) None of these
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