本题目来源于试卷: Physics Unit7: Linear Momentum，类别为 通用国际物理
[单选题]
A railroad car, of mass 200 kg, rolls with neglaw93uw)n4sg :; zr tqvwyc ;p8d) 8jdpigible friction on a hop qazzjekp)2nc yx *7ne3gi2:ndp ,6: rizontal track with a speed of 10 m/s. A 70-kg stunt man dropsg)c 2ap7qe:p nzy *n3iz kned:j62px, 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/s
B. 4.7 m/s
C. 7.4 m/s
D. 10 m/s
参考答案: C
本题详细解析:
暂无
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