如图A-1所示,一个劈形物体M,各面均光滑,放在固定的斜面上,上

如图A-1所示,一个劈形物体M,各面均光滑,放在固定的斜面上,上表面水平,在上表面放一个光滑小球m.劈形物体从静止开始释放,则小球在碰到斜面前的运动轨迹是()
A.沿斜面向下的直线  B.竖直向下的直线
C.无规则曲线           D.抛物线

答案


B
【试题分析】

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