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8.B【解析】若t时间内物体速度方向不发生变化,易知其速度减速为0经过的路程最短,即有s若物体t时减速为0继而反向运动,to时间内经过的路程为s1=,加速度为a=2,反向运动t-t0时间内的路程为2a(x-1)2=1,动(t-t0)2,全程路程为s=s1+s+uo t2、/wxE一(=(-1)A,当=2,即t=时,此时路程最短为(2-1)wt<,综上最短路程为(2-1)vt,B项正确。
Onepossibleversion:Atadistance.IcouldseeivianstrugglinginthewaterIswamtoherandmanagedtocatehherarm.Soon,theboatarrivedthereandthegirlspulledusoutonebyone.Luckily,everythingwasOKwithVivian.However,shewascoldandshakingwithfright.WeimmediatelytookViviantoherhouse.Whenherparentsheardwhathadhappenedtheywereshaken.Thedoctorcametoseeherandsaidthattherewasnoneedtoworry.Vivianwasallright.ShelookedatmewithtearsandtoldherparentsabouthowIjumpedintothewatertosaveher.ItoldVivianaboutmyswimmingclassesinmyoldschoolandpromisedtobethereforherinanydifficultsitation.IulsoremindedherofhowsheusedtocometomyhousetoteachmewhenIwasiliandthatshewasmybestfriend,andIjustdidthesameforhertodayHerparentsalsogotemotionalandhuggedmeVivianandIbecametruebestfriends.Fromthatday,wehavesupportedandhelpedeachotherineverypossibleway.Iwisheverypersoncouldexperienceafriendshiplikeours.
