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!

11. AD【解析】根据匀变速直线运动公式y2-v2=2ax得a=-0,则物体上滑的加速度为a1=0,物体下滑的加速度大小为,解得aa2=4:1,B错误:又2C由公式x=-a12得t,则可知工滑的时间与下滑的时间之比为1:2,A正确:物体下滑时,对c到b的过程2=2017c到a的过程(=2a2x,整理得v4V0C错误:上滑过程,由牛顿第二定律得: Mosin a+ mgcos a=ma,下滑过程,由牛顿第二定律得: Ingsin a-finmgcos a=ma2,又a1=4a2,联立解得=0.45,D正确。

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