锟斤拷锟斤拷锟斤拷锟絰锟斤拷锟竭讹拷锟斤拷锟斤拷锟斤拷锟絵锟斤拷锟斤拷锟节撅拷锟斤拷锟斤拷锟斤拷锟节讹拷锟斤拷锟斤拷锟斤拷锟角高匡拷锟絎(w锟斤拷ng)锟斤拷輯锟截烇拷叨锟斤拷锟斤拷锟斤拷x锟斤拷锟斤拷锟斤拷锟絵锟斤拷锟斤拷要訓锟斤拷锟斤拷锟斤拷锟截恒定锟缴的戯拷锟斤拷锟斤拷

锟斤拷锟斤拷1锟斤拷锟斤拷锟斤拷锟絚锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷俣葴p锟斤拷5m/s锟斤拷锟斤拷锟斤拷锟斤拷俣锟斤拷锟斤拷锟斤拷锟�3m/s锟斤拷锟絫锟阶★拷锟揭冿拷锟斤拷锟絴(zh锟斤拷)锟斤拷之锟斤拷m锟阶★拷m锟斤拷锟斤拷[]

锟斤拷锟斤拷A锟斤拷2锟斤拷1B锟斤拷3锟斤拷5C锟斤拷5锟斤拷3D锟斤拷1锟斤拷2

锟斤拷锟斤拷2锟斤拷A锟斤拷B锟斤拷锟斤拷锟节光滑水平锟斤拷锟斤拷锟斤拷锟斤拷锟絓锟接ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷停止锟絓锟斤拷锟斤拷锟絫锟斤拷锟斤拷锟絝锟斤拷锟斤拷锟斤拷锟絖锟斤拷锟斤拷[]

锟斤拷锟斤拷A锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷A锟斤拷锟劫度烇拷0锟斤拷锟絫锟斤拷前A锟侥勶拷锟斤拷一锟斤拷锟斤拷锟斤拷B锟侥勶拷锟斤拷

锟斤拷锟斤拷B锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷A锟斤拷锟劫度烇拷0锟斤拷锟絫锟斤拷前A锟侥勶拷锟斤拷一锟斤拷小锟斤拷B锟侥勶拷锟斤拷

锟斤拷锟斤拷C锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷B锟斤拷锟劫度烇拷0锟斤拷锟絫锟斤拷前A锟侥勶拷锟斤拷一锟斤拷锟斤拷锟斤拷B锟侥勶拷锟斤拷

锟斤拷锟斤拷D锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷B锟斤拷锟劫度烇拷0锟斤拷锟絫锟斤拷前A锟侥勶拷锟斤拷一锟斤拷小锟斤拷B锟侥勶拷锟斤拷

锟斤拷锟斤拷3锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷M锟斤拷原锟接猴拷锟斤拷原锟斤拷處锟斤拷锟給止锟斤拷B(t锟斤拷i)锟斤拷锟斤拷锟斤拷锟斤拷锟劫讹拷V锟脚筹拷一锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷m锟斤拷锟斤拷锟接時锟斤拷剩锟洁部锟街碉拷锟劫度烇拷[]

锟斤拷锟斤拷A锟斤拷mV/(M-m)B锟斤拷-mV/(M—m)

锟斤拷锟斤拷C锟斤拷mV/(M+m)D锟斤拷-mV/(M锟斤拷m)

锟斤拷锟斤拷4锟斤拷小車锟給止锟节光滑锟斤拷水平锟斤拷锟较ｏ拷A锟斤拷B锟斤拷锟剿分別站锟斤拷車锟斤拷锟斤拷锟斤拷锟揭兩讹拷锟斤拷A锟斤拷B锟斤拷锟斤拷同锟絩锟斤拷锟斤拷锟絓锟斤拷锟斤拷锟剿時小車锟斤拷锟斤拷锟絓锟接ｏ拷锟斤拷锟斤拷锟斤拷r锟斤拷锟斤拷锟斤拷[]

锟斤拷锟斤拷A锟斤拷A锟斤拷B锟絴(zh锟斤拷)锟斤拷锟斤拷龋锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷B锟斤拷A锟斤拷B锟絴(zh锟斤拷)锟斤拷锟斤拷龋锟紸锟斤拷锟劫讹拷小

锟斤拷锟斤拷C锟斤拷A锟斤拷B锟斤拷锟斤拷锟斤拷锟�锟斤拷A锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷

锟斤拷锟斤拷D锟斤拷A锟斤拷B锟斤拷锟斤拷锟斤拷龋锟紹锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷

锟斤拷锟斤拷5锟斤拷锟节光滑水平锟斤拷锟斤拷锟叫冿拷锟絭車锟斤拷锟斤拷锟斤拷謩e站锟斤拷A锟斤拷B锟缴傦拷锟剿ｏ拷锟斤拷锟絚車锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷锟�锟斤拷锟斤拷A锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟津，冿拷車锟斤拷锟斤拷锟斤拷锟給止锟斤拷B(t锟斤拷i)锟斤拷锟斤拷A锟斤拷锟斤拷锟斤拷锟津拋給B锟斤拷B锟接碉拷锟斤拷锟斤拷锟街掞拷锟給A锟斤拷锟斤拷朔锟斤拷投锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟紹锟斤拷锟斤拷锟叫ｏ拷锟絫锟絇锟斤拷A锟斤拷B锟斤拷锟绞达拷小锟斤拷[]

锟斤拷锟斤拷A锟斤拷A锟斤拷B锟斤拷車锟斤拷锟斤拷锟斤拷锟紹锟斤拷A車锟斤拷锟绞达拷

锟斤拷锟斤拷C锟斤拷A車锟斤拷锟斤拷小D锟斤拷锟斤拷車锟斤拷锟斤拷锟斤拷锟給止锟斤拷B(t锟斤拷i)

锟斤拷锟斤拷6锟斤拷锟节光滑锟斤拷水平锟斤拷锟斤拷锟斤拷A锟斤拷B锟斤拷锟絭锟絴(zh锟斤拷)锟斤拷锟斤拷锟斤拷m锟斤拷小車锟斤拷锟斤拷锟斤拷锟給止锟斤拷B(t锟斤拷i)锟斤拷A車锟斤拷站锟斤拷一锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷m/2锟斤拷锟斤拷锟斤拷锟斤拷锟剿忥拷A車锟斤拷锟斤拷B車锟较ｏ拷锟斤拷锟絚B車锟斤拷锟斤拷锟斤拷锟斤拷锟給止锟斤拷锟絫A車锟絚B車锟劫度达拷小锟饺碉拷锟斤拷______锟斤拷A車锟絚B車锟斤拷锟斤拷锟斤拷小锟饺碉拷锟斤拷______

锟斤拷锟斤拷7锟斤拷锟斤拷水平锟斤拷锟斤拷锟絯锟叫碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟劫讹拷锟斤拷20m/s锟斤拷锟节匡拷锟叫憋拷炸锟斤拷锟斤拷殉锟�1kg锟斤拷0.5kg锟斤拷锟角兩诧拷锟斤拷锟斤拷锟斤拷锟斤拷0.5kg锟斤拷锟角诧拷锟斤拷锟斤拷10m/s锟斤拷锟劫讹拷锟絚原锟劫凤拷锟斤拷锟絓锟斤拷锟斤拷锟絫锟斤拷一锟斤拷锟街此時锟斤拷锟劫度达拷小锟斤拷______锟斤拷锟斤拷锟斤拷______锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷1锟斤拷B2锟斤拷AD3锟斤拷B4C5锟斤拷B6锟斤拷3锟斤拷2锟斤拷3锟斤拷2

锟斤拷锟斤拷7锟斤拷35m/s锟斤拷原锟劫凤拷锟斤拷