题目

做变速直线运动的物体,初速度为30 m/s,t s后的速度为v=30-1.5t-4,求该物体停止时,运动的路程是多少? 答案：解：设物体经过t s后停止,由30-1.5t-4=0,得t=,运动路程为—What are you going to do next month?—I am going to travel to Germany which is________European country.A.aB.anC.theD./