在市区某路段同一直行车道上,甲车在后、乙车在前同向匀速行驶,甲车速度v1=12m/s,乙车速度v2=8m/s.当甲车车头与乙车车尾距离s=5m时,甲车开始刹车做匀减速运动.问:甲车的加速度大小需满足什么条件,才能避免和乙车追尾相撞?
I hear people talk about “Wisdom of the printed page”. They wonder .