在光滑的水平桌面上,放一根长为一的链条,链条眼桌边挂在桌外的长度为a,求链条全部离开桌面时的速度
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![在光滑的水平桌面上,放一根长为一的链条,链条眼桌边挂在桌外的长度为a,求链条全部离开桌面时的速度](/uploads/image/z/5361131-11-1.jpg?t=%E5%9C%A8%E5%85%89%E6%BB%91%E7%9A%84%E6%B0%B4%E5%B9%B3%E6%A1%8C%E9%9D%A2%E4%B8%8A%2C%E6%94%BE%E4%B8%80%E6%A0%B9%E9%95%BF%E4%B8%BA%E4%B8%80%E7%9A%84%E9%93%BE%E6%9D%A1%2C%E9%93%BE%E6%9D%A1%E7%9C%BC%E6%A1%8C%E8%BE%B9%E6%8C%82%E5%9C%A8%E6%A1%8C%E5%A4%96%E7%9A%84%E9%95%BF%E5%BA%A6%E4%B8%BAa%2C%E6%B1%82%E9%93%BE%E6%9D%A1%E5%85%A8%E9%83%A8%E7%A6%BB%E5%BC%80%E6%A1%8C%E9%9D%A2%E6%97%B6%E7%9A%84%E9%80%9F%E5%BA%A6)
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