問題詳情
18. 一小球在光滑軌道內側依順時針方向作鉛直圓周運動，小球通過最高點瞬間，速度與加速度的方向分別為何？
(A) →，→
(B) →，↓
(C) ↑，→
(D) →，↑
(A) →，→
(B) →，↓
(C) ↑，→
(D) →，↑
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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