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第二节(满分25分[文])Soon I created my website go. picking up. com. On the website I launched a rubbish removacam[章]paign. I described[来] my purpose-c[自]alling on volunteer[知]s to pick up rubbish. I posted pictures ofrubbish[嘛] littered about on the website, which could not only illustrat[答]e the severe situation[案] but alsoshow that a large number of volunteer[网]s were in great need. Besides, I shared the story of VLady who influence[文]d me so much. Surprisin[章]gly, my website gradually[来] became a big hit on theIntern[自]etMore and more people put on vests with their own names. Volunteer[知]s could be seen pickinup rubbish in their spare time. The yellow vests made beautiful[嘛] scenery in the park or on thestreet[答]. With our joint efforts the environme[案]nt became better and better What delighted[网] me mostwas that peoples awareness[文] of environme[章]ntal protectio[来]n was improved.[自] The rubbish removalca[知]mpaign was a big success. Thanks to Vest Lady who rooted the sense of environme[嘛]ntalprote[答]ction in my mind, more people became Vest Lady
15.参考答案(1[案])乙丙整体上滑过程[网]机械能守恒有(m乙[文]+m)v2=(m乙[章]+m丙)gh(1分[来])乙丙碰撞过程动量[自]守恒有m乙乙=(m[知]乙+m丙)v(1分[嘛])能量守恒有mz呢[答]=(m2+mn)+[案]△E(1分)解得△[网]E=506.25J[文](1分)(2)设甲[章]乙弹开后甲的速度为[来]v甲,则v=7(1[自]分)弹开过程,动量[知]守恒有m乙v乙=m[嘛]v甲(1分)由功能[答]关系得W=2m乙吃[案]+m甲(1分)解得[网]W=1316.25[文]J(1分)
