一个运动员将以水平速度8m/s飞来的足球一脚反向踢回,踢回后球速为12m/s,则 发布时间:2017-04-25 05:56 │ 来源:www.tikuol.com 题型:填空题 问题: 一个运动员将以水平速度8m/s飞来的足球一脚反向踢回,踢回后球速为12m/s,则此过程中球的速度变化量大小为______,若球与脚的作用时间约为0.1秒,则此过程中球的平均加速度大小为______.
题型:填空题 补全对话。A: What are you going 1 2 when you 3 up? B: I'm going to be a baseball 4 . A: 5 are you going to do that? B: I'm going to 6 baseball every day. A: 7 are you going to practice? B: I'm going to practice in the sports center. A: 8 do you 9 there? B: I get there 10 a bike. 1.______2.______3.______4.______5.______6.______7.______8.______9.______10.______ 查看答案