2022-2022英语周报高三HZ19期答案

14.【解析】(1)物体在最高点时,设水平速度为v,水平加速度为a,水平位移为x,风力为F已知E1=15J(1分)ma(1分)=2ax(1分)则风力做的功W=Fx(1分)解得W=5J(1分)(2)设初速度为v,初动能Eo=mv6=20J,设从开始到最高点所用的时间为t,则有0-g(1分)U=at(1分)解得m=2(1分)(3)因为物体在竖直方向上做竖直上抛运动,根据对称性可知从开始到再次回到与抛出点等高处所用的时间为2t(1分):从开始到再次回到与抛出点等高处的水平位移为X则X=a(2t)(1分)设再次回到与抛出点等高处的动能为E末,由动能定理得FⅩ=Ek末一E0(1分)解得Ek末=40J(1分)

第二节书面表达One possible versionHow to prevent online gaming addictionWith the popularity of mobile phones, more and moreteenagers are addicted to the Internet games, which doesgreat harm to their health and studies. Spending too muchtime in the virtual world, addicts will become cold and distant. What's worse, if exposed to violent games, playerstend to be more aggressive than usualTo prevent the addiction, we should often remind our-selves of these bad effects. Besides, we can do more out-door activities, which will keep our attention off the Internetgames. If hooked on online games, gradually reduce theamount of time spent on the games until we finally get rid ofthe addiction. We can also ask for help from our relativesteachers or friends

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