如图所示在研究平抛运动时小球a沿轨道�下离开轨道末端时撞开轻质接触式开关s被电磁铁吸住的小球b同时自由下落.改变整个装置的高度做同样的 Template




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tomski如图所示在研究平抛运动时小球a沿轨道�下离开轨道末端时撞开轻质接触式开关s被电磁铁吸住的小球b同时自由下落.改变整个装置的高度做同样的 coloring