[其它] 動力學問題
請教大家一個動力學的小觀念
http://i.imgur.com/qxxALc1.jpg
為什麼mass B 與牆面碰撞的時候
沒有線動量守恆這個條件呢？
我觀念哪裡錯誤了嗎？
請教大家 謝謝!!
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