7.如图所示一固定不动的光�斜面倾角为θ高为h一质量为m的物体从斜面的顶端由静止开始�下求物体从顶端�到底端所用的时间及�到底端时 Template




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tomski7.如图所示一固定不动的光�斜面倾角为θ高为h一质量为m的物体从斜面的顶端由静止开始�下求物体从顶端�到底端所用的时间及�到底端时 coloring