2018-2022英语周报八年级上册第25期答案

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!

17.(1)mgl(2)/3L(3)8【解析】(1)A在B上滑行时,其受力如图甲所示m迟g由牛顿第二定律有mAgin 8-/3 cos O=mAa.A(2分)对B受力分析如图乙所示由牛顿第二定律有mmBgsin 0+ mArcos 0-42(mA+mBgcos 0=mBaB(2分)由运动学规律有2L=-aAt(1分)(1分)

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