试题与答案

汽车自O点出发从静止开始在平直公路上作匀加速直线运动,途中在6s时间内分别经过P、Q

题型:单项选择题

题目:

汽车自O点出发从静止开始在平直公路上作匀加速直线运动,途中在6s时间内分别经过P、Q两根电杆已知P,Q相距60m,车经过Q时的速率是15m/s,则下列说法不正确的是()

A.车的加速度为1.5m/s²

B.经过P时的速率为5m/s

C.P、O两点间距为7.5m

D.车从出发到Q所用的时间为9s

答案:

参考答案:A

解析:

经过PQ过程的平均速度得经过P点的速度为5m/s,B正确;由,A错误;由得P、O两点间距为7.5m,C正确;由得车从出发到Q所用的时间为9s,D正确。

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