問題詳情
4.如圖所示，小明手持米尺，使米尺下端零點位於小華拇指與食指之間。小華一看到小明鬆手，就立即抓握米尺，結果米尺落下 0.8 公尺。若重力加速度為 10 米／秒2，則小華的反應時間約為多少秒﹖ 
(A)0.3
(B)3
(C)0.4
(D)4
(A)0.3
(B)3
(C)0.4
(D)4
參考答案
答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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