粗细均匀,全长为l的铁链,一半在光滑的桌面上,另一半悬垂在桌沿之下,从静止释放后,铁链下落,下落时铁链和桌沿无摩擦,则铁链上端刚离开证明时铁链的速度是多大?
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![粗细均匀,全长为l的铁链,一半在光滑的桌面上,另一半悬垂在桌沿之下,从静止释放后,铁链下落,下落时铁链和桌沿无摩擦,则铁链上端刚离开证明时铁链的速度是多大?](/uploads/image/z/5099640-24-0.jpg?t=%E7%B2%97%E7%BB%86%E5%9D%87%E5%8C%80%2C%E5%85%A8%E9%95%BF%E4%B8%BAl%E7%9A%84%E9%93%81%E9%93%BE%2C%E4%B8%80%E5%8D%8A%E5%9C%A8%E5%85%89%E6%BB%91%E7%9A%84%E6%A1%8C%E9%9D%A2%E4%B8%8A%2C%E5%8F%A6%E4%B8%80%E5%8D%8A%E6%82%AC%E5%9E%82%E5%9C%A8%E6%A1%8C%E6%B2%BF%E4%B9%8B%E4%B8%8B%2C%E4%BB%8E%E9%9D%99%E6%AD%A2%E9%87%8A%E6%94%BE%E5%90%8E%2C%E9%93%81%E9%93%BE%E4%B8%8B%E8%90%BD%2C%E4%B8%8B%E8%90%BD%E6%97%B6%E9%93%81%E9%93%BE%E5%92%8C%E6%A1%8C%E6%B2%BF%E6%97%A0%E6%91%A9%E6%93%A6%2C%E5%88%99%E9%93%81%E9%93%BE%E4%B8%8A%E7%AB%AF%E5%88%9A%E7%A6%BB%E5%BC%80%E8%AF%81%E6%98%8E%E6%97%B6%E9%93%81%E9%93%BE%E7%9A%84%E9%80%9F%E5%BA%A6%E6%98%AF%E5%A4%9A%E5%A4%A7%3F)
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