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【单选题】
如图2所示,一辆小车在过山车的轨道上滑下。当小车越过图中所示位置时,小车沿运动方向的速度和加速度将怎样变化?()A.
两者都减小
B.
速度减小，但是加速度增加
C.
都保持不变
D.
速度增加，加速度减小
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