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!

14.(1)0.5m/s(2)45N【解析】(1)由题意可知,初始时A、B静止不动,设此时弹簧的压缩量为x0,对A、B整体受力分析有(ma+mB)gsin 8=kxo(1分)解得x0=0.2m设滑块B的加速度大小为a,则有a·(2t)(1分)解得a=2.5m/s2分离时两滑块速度相同,故A、B分离时滑块A的速度大小为(1分)解得v4=0.5m/s(1分)(2)设滑块A、B分离之前二者共同运动的距离为x1,则有(1分解得x1=0.05m故此时弹簧的压缩量为△x=xo-x1=0.15m刚分离时两滑块的加速度相同,对滑块A受力分析,由牛顿第二定律可得kAr-mAssin 0-Amag cos 0=maa(1分)√3解得p-2滑块A、B分离后,对滑块B,由牛顿第二定律可得F-mBg sin 8-um Bg cos 8=mBa(1分)解得F=45N(1分)

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