問題詳情
2. 兩物體A、B發生正向碰撞，碰撞後A和B都朝A原來移動的方向運動。下列推論何者正確？
(A)碰撞前A的速率一定比B大
(B)碰撞前A的動能一定比B大
(C)碰撞前A動量的大小一定比B大
(D)A的質量一定比B大
(E)A的密度一定比B大。
(A)碰撞前A的速率一定比B大
(B)碰撞前A的動能一定比B大
(C)碰撞前A動量的大小一定比B大
(D)A的質量一定比B大
(E)A的密度一定比B大。
參考答案
答案：C[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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