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匀变速直线运动

> 一辆汽车以12m/s的速度行驶，遇到紧急情况，司机采取制动措施，使汽车做匀减速直线运动，若制动后汽车加速度的大小为6m/s 2，则（　　） A．经3s，汽车的速度大小为6m/s B．经3s，汽车的位移大小为9m C．经3s，汽车的速度大小为2m/s D．经3s，汽车的位移大小为12m

问题：

发布时间：2024-09-12

一辆汽车以12m/s的速度行驶，遇到紧急情况，司机采取制动措施，使汽车做匀减速直线运动，若制动后汽车加速度的大小为6m/s ²，则（　　）

A．经3s，汽车的速度大小为6m/s

B．经3s，汽车的位移大小为9m

C．经3s，汽车的速度大小为2m/s

D．经3s，汽车的位移大小为12m

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