[領域] 碰撞 (題目相關領域)
[來源] university physics Harris Benson
[題目]http://ppt.cc/jjkK
[瓶頸]
我原本是用 子彈彈簧合體後的動能=彈力位能
可是這樣答案變成(M+m)E/m
如果硬要湊出答案的話
好像是要 原本子彈動能=子彈彈簧合體後的動能+彈力位能
題目是完全非彈性碰撞 力學能不守恒 為什麼還能這樣算呢?
感謝
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