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 freight car, mass 15,000 kg, icu idmeq +*uvg1*2vw*9 if3 u(u fl2trs allowed to coast along a z dsrqywo2 ;2.18p numlevel 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 td sz8wp .2;q2myron1uhe 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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