江西省2022届九年级期末综合评估英语试题答案

江西省2022届九年级期末综合评估英语试题答案，目前我们趣对答案已经整理了江西省2022届九年级期末综合评估英语试题答案的各科答案和试卷，更多试卷答案请关注本趣对答案。

21.AD小球从开始运动到落到轨道的过程做平抛运动,由题意可知,两次小球下落的高度相同,则由=√g可知两次小球运动的时间相同第一次以速度为w抛出后恰好落到c点时有x1=c1t= Rcos a+ Rsin a=53;第二次以速度抛出时小球落在d点时有x2=w2t=Rsa- Rsin a=R,所以动:w2=R:R=7:1,选项A正确;设两次平抛小555球落点竖直分速度为vy,根据平抛运动规律有3x=2×,由于h=Rsna+ Rcos a=x1,所以v=2a1,则两次小球落在c、d两点的速度之比为v功=√+:√+可=75:√19,选项B错误根据加速度的定义a=③可知速度的变化量△v=g·△t,由于下落时间相同,所以小球从开始运动到落到轨道上,两次小球速度的变化量相同,选项7RC错误;第一次小球的平均速度大小为=5√2E第二次小球的平均速度大小为动=25t5)=2R,可得:=7:5,选项D正确

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!