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範例:彈簧組合[87日大]

將一重物懸吊於一質量可忽略的彈簧下,在鉛直方向成平衡,此時彈簧的伸長量為ΔL,今將此彈簧由中間剪斷,利用被剪斷後的二彈簧將同一重物吊起,在鉛直方向成平衡(如圖所示)。若懸吊連接所耗去的長度可忽略,則此彈簧組合被重物拉長了多少? [87日大]


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