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为了研究平抛运动的水平和竖直两个方向的运动规律,某同学设计了如图甲、乙两个实验: 如图甲所示的实验中,A、B两球同时落地,说明_________________________________. 如图乙所示的实验中:将两斜滑道固定在同一竖直面内,最下端水平,滑道2与光滑水平板相接.质量相等的小钢球,从斜面的同一高度由静止释放,则他观察到的现象是_____________________________,这说明_________________________________________
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