問題詳情
10.某人舉槍打靶，靶離槍口的高度為4.5m，水平距離為6m，如右圖所示。當靶一開始下落時(自靜止開始)，此人立即開槍射擊。設此人射擊時槍管的仰角θ，試問若欲準確擊中靶，則子彈離開槍口的速度應為為25m/s，當靶被擊中時的高度在靶下落多遠處(g=10m/s2)
(A) 3.125
(B) 2. 25
(C) 1.25
(D) 0.75
(E)0.45 m
(A) 3.125
(B) 2. 25
(C) 1.25
(D) 0.75
(E)0.45 m
參考答案
答案：[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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