本题目来源于试卷: 2011 美国F=ma物理竞赛 F=ma physics competition，类别为 美国物理杯赛(Physics Bowl)
[单选题]
A child is sliding outv 7ay9 6iewlt: of x3nbhuh01 l op-/xpbqf/ja9 ;tz:(hacontrol with velocity $v_{\mathrm{c}}$ across a frozen lake. He runs head-on into another child, initially at rest, with 3 times the mass of the first child, who holds on so that the two now slide together. What is the velocity of the couple after the collision?
A. $2 v_{\mathrm{c}}$
B. $v_{\mathrm{c}}$
C. $v_{\mathrm{c}} / 2$
D. $v_{\mathrm{c}} / 3$
E. $v_{\mathrm{c}} / 4$
参考答案: A
本题详细解析:
暂无
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