题目

It is exciting to apply for a job that really attracts you．In making your application，there are a number of points for you to follow．     In your letter of application，say just enough to give a good account of yourself，without being tedious（冗长乏味）．If you are answering an advertisement，any information for which it asks must，of coupe，be given．This will usually cover your scholastic record and any further education and training．You may also be asked to give the names of one or two persons to supply references．For this purpose you should choose people who know(10分)如图所示，在成都天府大道某处安装了一台500万像素的固定雷达测速仪，可以准确抓拍超速车辆以及测量运动车辆的加速度。一辆汽车正从A点迎面驶向测速仪B，若测速仪与汽车相距355m，此时测速仪发出超声波，同时车由于紧急情况而急刹车，汽车运动到C处与超声波相遇，当测速仪接受到发射回来的超声波信号时，汽车恰好停止于D点，且此时汽车与测速仪相距335m，忽略测速仪安装高度的影响，可简化为如图所示分析（已知超声波速度为340m/s，）。 （1）求汽车刹车过程中的加速度a；（2）此路段有80km/h的限速标志，分析该汽车刹车前的行驶速度是否超速?