质量为m的小球用长为l的细线挂在o点在o点正下方l2处有一光�的钉子a如图所示把小球拉到与钉子a在同一高度的位置�线被钉子拦住且张 Template




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tomski质量为m的小球用长为l的细线挂在o点在o点正下方l2处有一光�的钉子a如图所示把小球拉到与钉子a在同一高度的位置�线被钉子拦住且张 coloring