球以速度 v 與靜止之球作斜向彈性碰撞後，球運動方向與入射方向夾角為30°。則若球質量為球之兩倍，則碰撞後球速率為若干？(A) (B) (C) 　(D) 　(E)

問題詳情

7. 球以速度 v 與靜止之球作斜向彈性碰撞後，球運動方向與入射方向夾角為30°。則若球質量為球之兩倍，則碰撞後球速率為若干？
(A)

(B)

(C)

　
(D)

　
(E)

參考答案

答案：E
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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