8.如下图所示物体由静止开始分别沿不同斜面由顶端a�至底端b两次下�的路径分别为图中的Ⅰ和Ⅱ两次物体与斜面间动�擦因数相同且不计路径Ⅱ Template




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tomski8.如下图所示物体由静止开始分别沿不同斜面由顶端a�至底端b两次下�的路径分别为图中的Ⅰ和Ⅱ两次物体与斜面间动�擦因数相同且不计路径Ⅱ coloring