本题目来源于试卷: Physics Unit7: Linear Momentum，类别为 国际高中通用物理
[单选题]
A railroad car, of mass 200 kg, rolls with negli d9vrh3q:s,arbwvwt 2n o)/:igible friction on a horizox3 0nreh5 mpo1 zwj 7tb+;mr1 )qkme)dntal track with a spen1507ew+o hm rm3rm k)d1jtz)xb;eq ped of 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/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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