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 freight car, mass 15,000 kg, ijjy+ ln4uiqm//zk(, w1(w mjvs allowed to coast along a9crzt (qvok q/pl4 8;x level track at a speed of 2.0 m/s. It collides and couples with a 50,000-kg second car, initially at rest and with brakes released. What is the speed of the two cars afterq8 (t /zqpvc9 kl;x4or coupling?
A. 0.46 m/s
B. 0.60 m/s
C. 1.2 m/s
D. 1.8 m/s
参考答案: A
本题详细解析:
暂无
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