“探究碰撞中的不变量”的实验中,入射小球m1=15g,原来静止的被碰小球m2=10g,由实验测得它们在碰撞前后的x﹣t图象如图所示,由图可 知,入射小球碰撞前的m1v1是____,入射小球碰撞后的m1v1是____,被碰小球碰撞后的m2v2是____,由此得出结论____.
仔细观察下面的漫画,假如你是漫画中那两个小朋友的同学,你如何劝说他们呢?
Although bike-sharing has some problems such as disorderly parking, it remains popular in Shenzhen.