来自李静铂的问题
【A15footladderisplacedagainstawall.Supposethebottomoftheladderslidesawayfromthewallataconstantrateof3ft.Howfastisthetopoftheladderslidingdownthewallwhenthebottomis9feetfromthewall?Answera.-9/4ftb.9/4ft】
A15footladderisplacedagainstawall.Supposethebottomoftheladderslidesawayfromthewallataconstantrateof3ft.Howfastisthetopoftheladderslidingdownthewallwhenthebottomis9feetfromthewall?
Answer
a.-9/4ftb.9/4ftc.-4/9ftd.Noneofthese
1回答
2020-11-09 04:44