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15.(2015厦门)安装在车辆前挡风玻璃上的行车记录仪,可以拍摄记录车辆行驶途中的影像,以保存证据,还原真相。在一次A、B两车追尾相撞交通事故中,交警调阅A车行车记录仪,看到道路前方正常行驶的车子纷纷“倒退”。突然发现B车超车变向,变道到A车前后却又放缓车速,即恶意刹车。A车避让不及,追尾相撞,如图所示。请用物理知识回答以下问题:
(1)如何理解“道路前方的车子纷纷‘倒退’”?
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(2)为什么恶意刹车容易造成追尾相撞的交通事故?
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