問題詳情
4. 質量m = 8.4 kg物體，以4.2 m/s速率在光滑水平面上運動，以完全彈性碰撞撞及另一靜止物體M。碰撞後物體m的反彈速率為0.40 m/s，如圖一。兩物體接觸時間為0.20 s，求在接觸期間，作用在物體m的平均力之量值約為多少N？
(A)60
(B)176
(C)185
(D)193
參考答案
答案：D
難度：非常困難0
統計：A(0),B(3),C(0),D(0),E(0)
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