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直線運動問題，課本寫的這段文字是什麼意思?
Jan 20th 2014, 01:10

問題：
http://imagizer.imageshack.us/v2/800x600q90/194/y5vo.jpg

算出來的答案是2.5秒

但題目說的：
這答案顯示出利用煞車以避免雷達槍偵測到你的超速是徒勞無功的?

我只有題目說的上面那段話不懂，解釋這裡就可以了
謝謝您抽空回答我問題，我會更努力學習的，感謝指導

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