![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
质量为m的小球A以水平速率v与静止在光滑水平面上质量为3m的小球B正碰后,小球A的速率为v/2,则碰后B球的速度为(以A球原方向为正方向)()
A.v/6
B.v
C.-v/3
D.v/2
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、v/2
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.v/6
B.v
C.-v/3
D.v/2
D、v/2
A.
B.
C.
D.
A. A的速率是B的2倍
B. A的动量大于B的动量
C. A受的力大于B受的力
D. 总动量为零
A、
B、
C、
D、
A.20 m/s
B.25 m/s
C.40 m/s
D.50 m/s