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範例:等速度運動與反應時間[98學測]

汽車後煞車燈的光源,若採用發光二極體(LED),則通電後亮起的時間,會比採用燈絲的白熾車燈大約快0.5秒,故有助於後車駕駛提前作出反應。假設後車以50 km/h的車速等速前進,則在0.5秒的時間內,後車前行的距離大約為多少公尺? (A)3 (B)7 (C)12 (D)25。

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Posted in 歷屆學測(推甄)考題, 物體運動的軌跡.

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