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．__________