长乐机场为福建省主要的国际机场，是我国航空国际口岸之一，机场跑道长为3250m，如图所示，厦门航空公司一架飞机从静止以恒定的加速度a=4m/s²加速，当速率达v=100m/s可升空.求：
（1） 25s； （ 2）、1250m
题目分析：
（1）飞机加速时间t=v/a=25s ①
（2）飞机加速前进的位移x1，由2a x1 =v2 ②
得 x1 =1250m ③
| 完型填空。 |
| I study 1 Taiyuan. My mother and 2 want 3 on a trip 4 the Great Wall. She 5 the Great Wall is very nice. We can 6 many things on it. It is about 360 kilometres 7 here to Beijing. We can go to Beijng 8 , on a bus 9 on a plane. It is too expensive to take a plane. Buses are slow. We want to 10 on a train. |
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