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求,(1)摩托车的最大速度,(2)若保持两个加速度不变,则仍行驶这段路程所需的最短时间及这种情况下的最大速度,15,(16分)羚羊从静止开始奔跑,经过x1=50m的距离能加速到最大速度v1=20m/s,并能维持很长时间,猎豹从静止开始奔跑,经过x2=75m的距离能加速到最大速度v2=30m/s
W:Butaren'tallyourteacherslikethat?M:Yes,theyare.ButsheisdifferentfromothersW:Inwhatsense?Whyissheunique?M:Sheisagreatproblemsolver.Anydoubtswillbeinstantlyclarifiednomatterwhatthesituationis.Sheneverscoldsforaskingevenasillyquestion.Forher,allstudentsarethesamenomatterhowstudiousorweak.W:Thatisverynice.Nowondersheisyourfavoriteteacher.Text7W:Hi,couldyoupleasehelpmeoutwithhowtogettoAmstelRiver?M:It'sa20-minutedrivefromhere.Hireataxiaheadandyou'regoodtogo.W:Great!But,I'mafraidalittlelateforthelightfestival.Whatisthequickestwayofgettingthereaccordingtoyou?M:Istillrecommendthetaxi,asthesubwayisatleast15minutesfromhereandthenthetrainjourneywilltakeyouanothersevenminutesatleast.W:Thankyousomuch!Onelastquestion.Couldyoutellmewhereexactlywearerightnow?M:Sure.YouareatTheMuntSquare.IsthisyourfirstvisittoAmsterdam?W:Yes.That'sevident,isn'tit?(Inafriendlymanner).Well,thankyousomuch!You'vebeenagreathelpindeed.M:Noworries!It'sallgoodbrothers.HaveagreatvacationhereandImusttellyouthelightfestivalisanexperienceofalifetime!Takecare.Text8W:WelcometoBigBurger.MayItakeyourorder?M:Yes,please!Iwouldlikeachickenburgerandsomefries.W:Burgerwithcheeseorwithoutcheese?M:Ah!Without.W:SureSir.Whatwouldyouliketodrinkoristhatall?Wehaveblackcoffee,beer,afewtypesoftea,orangejuice.M:Ughh...Yes.Acupofblackcoffee,please.W:Sure.AnAmericano,aCappuccinooraLatte?Whatwouldyouprefer?M:Well...IwouldliketogoinforaCappuccino.W:Smallormedium?M:Asmallworkswithme.W:Sir,so,that'syourfinalorder,isn'tit?M:Yes.W:Sir,allowmetoconfirmyourorder.Sothat'sonechickenburger,mediumfriesandasmallcoffee.Forhereortogo?M:Forhere.W:Alright,sothat's$5.83M:Hereyougo.W:Thankyouandhere'syourfourdollarsandseventeencentsinchange.Enjoyyourmealandhaveagreatday.第4页共5页