问题
选择题
—Why do you think the man is running?
—He could be running ________. [ ]
A. to exercise
B. for exercise
C. for exercises
D. to exercises
答案
答案：B
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—Why do you think the man is running?
—He could be running ________. [ ]
A. to exercise
B. for exercise
C. for exercises
D. to exercises
答案：B
一辆电动玩具车A点由静止开始以加速度a1在地面上做匀加速直线运动，经过一段时间后立即做匀减速运动，最后停在C点．每隔0.2秒钟通过速度传感器测量物体的瞬时速度，下表给出了部分测量数据．求：
| t （ s ） | 0.0 | 0.2 | 0.4 | … | 1.2 | 1.4 | … |
| v（ m/s ） | 0.0 | 1.0 | 2.0 | … | 1.1 | 0.7 | … |
（2）AC的距离
（3）t=0.6s 时的瞬时速度 v．