[填空题]
You have been hired as an expert witn; 3+9z) opgp4t0qpxstaqykd*ess in a court case i+ 8bd/vft/y .+3ugd-n.yjep dviv nx* nvolving an automobile accident. The accident involved car A of mass 1900 kg which crashed into stationary car B of mass 1100 kg. The driver of car A applied his brakes 15 m before he crashed into car B. After the collision, car A slid 18 m while car B sl.n+gfd+xe *3-v vdjy/8u./b d ivntpy id 30 m. The coefficient of kinetic friction between the locked wheels and the road was measured to be 0.60. Show that the driver of car A was exceeding the 55-mph (90km/h) speed limit before applying the brakes. mi/h
