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【单选题】
在光滑水平面上,一质量为m、速度大小为v的A球与质量为2m静止的B球碰撞后,A球的速度方向与碰撞前相反。则碰撞后B球的速度大小可能是( )A.
0.6v
B.
0.4v
C.
0.3v
D.
0.2v
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