新近看到一资料中有一道贴近生活的好题,其题目和解答如下.题目:有人自驾车出行,狗为了追上车而狂奔.已知车启动时与狗相距120m,狗可以认为是做匀速直线运动,速度为15m/s.车的加速度为1m/s2.当只有狗与车相距小于20m时,驾驶员才能通过反光镜发现它,且立即刹车,刹车的加速度为5m There is a good question closely related to life in a newly-listed document. The title and answer are as follows. Title: Someone has traveled by car and the dog rushed in order to catch up with the car. The known car is 120m away from the dog when it starts up. Dogs can be thought of as Uniform linear motion with speed of 15m/s. Acceleration of the car is 1m/s2. When the distance between the dog and the car is less than 20m, the driver can find it through the mirror and brake immediately. The acceleration of the brake is 5m.