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从时速400到完全刹停需要多久？4秒，F1赛车是怎么做到的？
一辆时速100公里的汽车从紧急制动到彻底停下需要多久呢？差不多需要个4、5秒钟。那么时速在300-400公里的F1方程式赛车，刹车需要多久呢？其实也是4秒，这是怎么做到的？
科学慢漫谈49/171
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