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13.(10分)解[文]析(1)由牛颜第二[章]定律得F-4ng=[来]阳444（1分)由[自]匀变速直线运动公式[知]得v3=2xp…([嘛]1分)PQ之间的运[答]动：V-V哈=2a[案]X.(1分)在擦拭[网]过的冰面上由牛顿第[文]二定律得kug=E[章]'(1分)解得K=0[来].6….(1分)([自]2)碰撞瞬间由动量[知]守恒定律得，vam[嘛]va+mva(2分[答])碰撞后B和A分别[案]继续向前运动，对B[网]物体：Vg=2ax[文]g(1分)对A物体[章]；V收=2aXa…[来](1分)解得X4=[自]0.8m,所以△X[知]=1m(1分)(没[嘛]有计算X,最终结果[答]正确也给满分)
四、书面表达One[案] possible version:D[网]ear Jasmin,I'm glad to know that you plan to get vaccinate[文]d inChina.I[章]'m writing to tell you some do's and don'ts for thevaccin[来]ation against COVID-19.[自]To begin with,have[知] enough sleep and do not drinkalco[嘛]hol,coffe[答]e and strong tea the day before vaccinati[案]on.Beside[网]s,take your passport and valid residence[文] permit withyou when you get vaccinate[章]d.What's more,it is requiredt[来]hat you should stay for 30 minutes of observati[自]on at thevaccin[知]ation site.You are forbidden[嘛] to bathe or showerwit[答]hin 24 hours after the vaccinati[案]on.Finall[网]y,don't forgetto wear a mask to protect yourself and others when havingthe[文] injection[章].I hope the informati[来]on above can be of some helpto you.Yours[自],Li Hua
