問題詳情
4. 質量相同的甲、乙兩球各以10公尺/秒、1公尺/秒的速率同向作正向碰撞，碰撞過程中，甲所受的衝量大小為45牛頓 × 秒，則乙球質量為
(A)
(B)
(C)
(D)
(E)公斤。
(A)
(B)
(C)
(D)
(E)公斤。
參考答案
答案：B[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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