2．在水平面上有两个质量分别为m₁和m₂的物体，且m₁=2m₂，假定它们具有的初动能相等，所受的阻力也相等，那么这两个物体停止时经过的距离之比s₁：s₂=_______，原来初速度之比为_____________。

1．____________的发现，证明原子不是不可再分的；______________的发现，反映了原子结构的特性。

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六、论述题

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五、分析说明题

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28．____________    29．____________    30．____________    31．__________