试题与答案

一辆执勤的警车停在平直的公路旁,当警员发现有一辆违章的货车从他旁边以8m/s的速

题型:问答题

题目:

一辆执勤的警车停在平直的公路旁,当警员发现有一辆违章的货车从他旁边以8m/s的速度匀速经过时,立即上车追赶,当警车开动时,货车已经在前方20m处了,已知警车做匀加速直线运动,加速度大小为2m/s2,求:

(1)警车要多长时间才能追上货车?

(2)警车在追上货车之前,两车间的最大间距是多少?

答案:

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