问题描述:
请大家帮帮忙,
问题解答:
设所求为hh=g*t^2/2,h+2=g*(t+0.25)^2/2解得 h=(4096 - 128g + g^2)/(128g)=729/320=2.27813
窗口的顶端距屋檐的高度为hh=(1/2)gt^2=5t^2h+Δh=(1/2)g(t+0.25)^2=5(t+0.25)^2上式代入下式,得2=5(t+0.25)^2-5t^2=5(0.5t+0.0625)t=0.675sh=5t^2=5*(0.675*0.675)=2.278