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A railroad car, of mass 200 kg, rolls with negligible friction on a horizontal track with a speedof 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car.How fast will the car be moving after this happens?A) 2.8 m/sB) 4.7 m/sC) 7.4 m/sD) 10 m/s
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