本题目来源于试卷: Physics Unit7: Linear Momentum，类别为 通用国际物理
[单选题]
Two cars collide head-on on a levelrz e)llzm* m 3jc2c .z m).1yv7kxekvnt6w +p: friction-free road. The collision was comple67 lrm2 pze*j1)) 3:cz ltkexy.+nmv.ck zv mw7mze-m7y ;uxz tely inelaze-7x7m;my z ustic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?
A. It was always zero.
B. It was never zero.
C. It was not zero, but ended up zero.
D. none of the above
参考答案: A
本题详细解析:
暂无
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