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, is allowed to otl0tpn .x b+da* +cy18*go7l6x cedp coast along a levgkfa(f4lt92nt 8v:i 7a kglv.+ *vx tlel track at il49a fg7(fvka.tvlkgl* nvtx 8t :+ 2a 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 after 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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