关于跳伞的英语作文

Dearmother:I'myourchild.TodayisMother'sday.Ihavealotofsayingtoyou.Thankyouyourlove!Letmeknowhowtobea

Mother,howletchildrenadmiredthewords,Love,likefeedinghowourquietharbour.Loveispure,Loveisselfless,Lo

亲爱的邻居,我是隔壁的李华.很高兴我们能作为邻居,彼此照应.人说远亲不如近邻,以后用得着的地方,请尽管开口,不要拘束.前两天我的爷爷奶奶长途奔波来到这个异国他乡,看我.请大家星星方便,配合配合,让他们

Dear***,Howiseverythinggoingonwithyou?Iaminacafetowritethispostcardtoyou.Todayisafineday.Thesunshine

MyhobbyMyhobbyisliseteningtomusic.Ilikelisteningtomusicbest.Becauselisteningtomusicmakesmerelaxed.Wh

植树节英语：ArborDay（植树节）Inmanycountriesithaslongbeenthetraditiontoholdanannualtreeorforestfestival.Theori

Therearefivepeopleinmyfamily--myparents,mybrother,mysisterandI.Myfatheris48yearsold.Heisfondoffundan

Mystationinuniversitycampusinchterritory,breathesandfeelsaherefreshness.Theuniversitylifelikethissta

ItisaniceSunday.Theairisfreshandtheskyisblue.TheclassmatesofClassoneGradesevenishavingapiniconNanSha

先说好了金币.!鄙人不才在悉尼读书几个月了再答：Currently,thehazehasbeenathornyproblemwhichisexertinganegativeeffectonpeople

asweallknowthatwaterpollutionintheworldismoreseriousthaneverbefore.Therearemanyreasonstoblame.Oneist

YuanLongping(bornSeptember7,1930)isaChineseagriculturalscientistandeducator,knownfordevelopingthefir

YuanLongpingwasbornonSeptember7,1930.Inthe1960sChinaexperiencedfaminedandhecameupwithanideaforhybrid

英国人的生活习惯英语作文.0解决时间：ThuJan0817:58:59CST2009.题目：英国人的生活习惯在线等.急.关于英国的英语作文：

（1）设飞机离地面高度是h,展伞时离地面高度为h'.展伞时速度为v1.落地速度最大不得超过v22g(h-h')=(v1)^22ah'=(v1)^2-（v2)^2v2=5m/s联立得：h'=99m设着地

WonderfulJourneytoXiamenI'vebeenfondoftakingtripstosomecoatalplaceswhereIgotthechancetoenjoythebeaut

补充一下问题吧你要问的是什么?为什么只有一半的问题啊

去wikipedia搜索,应该有.

第一个问题缺少条件的,如果忽略水平方向的阻力,那么水平速度永远都是400KM/H.如果考虑阻力,则肯定会速度下降的.第二个问题是会出现匀速的,因为一般来说竖直方向的阻力与速度的平方成正比,当速度逐渐变