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18.D[命题立意[文]]本题考查机械能的[章]知识,意在考查考生[来]对平抛运动的理解,[自]考查的核心素养是形[知]成基本的物理观念和[嘛]良好[试题解析]当[答]A=0、8m时,小[案]球运动到最离点,四[网]为小球恰能到达最高[文]点C,则有mg=m[章]解得v=√kr-2[来]m/s,则x=4m[自]2/s2,故A项错[知]误;从A点到C点的[嘛]过程中,动能减少量[答]△E=mm02=1[案].05J,重力势能[网]的增加量为△Emg[文]2r=0.8J.则[章]机械能减少量为0.[来]25J,由于从A点[自]到B点过程中的压力[知]大于从B点到C点过[嘛]程中的压力,则从A[答]点到B点过程中的摩[案]擦力大于从B点到C[网]点过程中的摩擦力,[文]可知从B点到C点的[章]过程克服摩擦力做功[来]较少,则机械能损失[自]小于0.125J.[知]故B项错误;小球从[嘛]A点到C点摩擦力做[答]功为0.25J,故[案]C项错误;小球从C[网]点抛出后做平抛运动[文],根据12,可得小[章]球从抛出到落到地面[来]上的时间为t=0.[自]4则落地点到A点的[知]距离x=v=2×0[嘛].4m=0.8m,[答]故D项正
第四部分写作第一节[案]短文改错Last Friday, we had a PE lesson on theplaygr[网]ound, during that we learned how to do thehichlo[文]ng jump. After some warming-u[章]p exercises[来], ourexerci[自]seteacher[知] showed us how to do it and asked us to payattent[嘛]ionA safety. Then we followed the teacher andpracti[答]sed one after other. When it was my turn, Ianotherf[案]eel very nervous. I failed at my first try, and I didn'tbutlose heart. I kept on practise.[网] At last, I jumpedact[文]Isover 2 metres longer. I was exciting that I succeeded[章]long已xThi[来]s lesson made me realize that it's true that hardwork will eventuall[自]y pay A off
