2022英语周报高二课标综合第28期答案

參考范文about a week later, Pomilla and Andrew got to meet her son'sSavion comilla and Andrew arrived at the metro station at theappointed time, anxiously waiting for Case to come. When Casearrived with a big smile, they felt very happy and excited. Casehugged Andrew warm-heartedly and reached out his right hand, sayingto him. Would you like to take it again?"without hesitation theboy took it and held it firmly. After talking for some time, Pomillatook out the badge and gave it back to Case. Many passengers tookictures of the sceneTaylor Pomilla was moved and expressed her thanks to Caseagain She asked Case how he could calm andrew down at that timeCase told her that he had a daughter with autism and that he hadreceived special training on how to deal with autistic children. Hepromised to visit them often to help Andrew grow up happily. As hewas talking, he took out a police badge that he made by hiimself andgave it to Andrew, who was more than happy to accept it. Ever sincethen they have been friends

15.(1)0.48m(2)2s【解析】(1)乙向下做匀加速直线运动,加速度大小为2gcos30°+m:sin30°=12.5m/s2(1分)甲向下做匀减速直线运动,加速度大小为a:=u: m,gcos 30"+AI(n+m:)g cos 30-mI gsin 30设甲和乙刚好达到共同速度时速度为v1,所用时间为t1,根据运动学公式可得(1分)甲的位移为x甲=D1:-2ai=0.84m(1分)乙的位移为xz=a1!i=0.36乙相对甲滑行的最大距离△(2)当甲和乙刚好达到共同速度的瞬间启动传送带时,对甲、乙系统,有p1(m1+m2)gcos30°=(m1+m2)gsin30°(1分)所以甲、乙与传送带共速前,甲、乙一起做匀速直线运动,运动时间为(]分)甲、乙一起运动的位移x1=v;t2=3m(1分)甲、乙与传送带共速后,甲、乙与传送带一起做匀加速直线运动,根据运动学公式有L=vts+at(1分)解得t3=1s(1分)从启动传送带到甲的下端运动到传送带底端N点所用的时间t=t2+t3=2s(1分)

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