問題詳情
3. 一質量為0.1千克的木塊在光滑地板上以1公尺/秒的速度作等速運動，此時有一子彈迎面射來而嵌入木塊中，設子彈質量為1公克，速率為1公里/秒，則子彈射入木塊之後，木塊之速率為
(A)8.
(B)1.
(C)4.
(D)9.
(E)19.公尺/秒。
(A)8.
(B)1.
(C)4.
(D)9.
(E)19.公尺/秒。
參考答案
答案：A[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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