题目

第二节：读写任务(共1小题，满分25分) 阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 Why is it that we tend to value relationships more once they've ended? Is it simply human nature to take for granted the smile of someone close，the friendship of a relative，the concern of a neighbor? In the moment，we think that these people will be around forever. Most of us never stop to imagine all those who have a profound impact on our lives. It’s so easy to justify this casual attitude by saying we are too busy, too tired，too involved with work，t如图 所示，高h＝0.45 m的光滑水平桌面上有质量m1＝2 kg的物体，以水平速度v1＝5 m/s向右运动，与静止的另一质量m2＝1 kg的物体相碰．若碰撞后m1仍向右运动，速度变为v1′＝3 m/s，求：(不计空气阻力，g＝10 m/s2)(1)m2落地时距桌边缘A点的水平距离；(2)m2落地时动量的大小．