英语周报 2018-2022 高二 AHW 30答案

第三节One possible versionParagraph 1And not tery long after that, he made a surprisingdecision. He decided to use all his rights, preparing for hislife at the remote island. In the first year he sent troopsveterinarians and animal trainers to kill the wild animals ortrain them for good use. The task was so huge but it wasworthwhile. Then the king sent a lot of farmers to start awide rice field and began to grow rice. Next he had manyfacilities, from hospital to school, built. After that he senta lot of educated people there. At last he sent all his fami-lies to the islandParagraph 2Finally the time came when the king had to be thrownatay to the island. With many strong soldiers catchinghimsmiled. He had prepared everything for thefinalWhen he was sent lo the island, the island had takenon a new look. Everybody there lived a comfortable life andthe king was welcomed warmly by his people. THcheered, "Long live the wise king. "The wise king livedhappily ever after. The clever people live now in the worldto prepare for their life in the future

18【解析】(1)由运动学公式得s=2a6解得a=6m/s2(1分)由牛顿第二定律得F=ma解得F=12N(1分)(2)滑块滑到长木板上时的速度v=at=6m/s(1分)分别对滑块和长木板由牛顿第二定律得u2 mng-ma1(1分)u2mg-A(m+ M)g=Maz分二者速度相等时有v1=7-a1t=a2t解得t=1s分)此过程中滑块的位移=t-2a12=3.5m(1分长木板的位移4)a12=0.5m(1分)则滑块相对长木板的位移△s=s1-52=3m距长木板右端的距离a=L-△s=1m(1分)(3)由(2)得v1=v-a1t=a2t=1m/s1分)共速后两者保持相对静止一起做匀减速运动,对整体由牛顿第二定律得uI(m+Mg=(m+M)a3(1分)解得a3=1m/s2(1分)由运动学公式得v=2a33解得s3=0.5m(1分)长木板滑行的总距离为=2+s3=1m(1分)

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