一石子从高楼顶的边缘*下落,经过低层楼的时间为0.15s,已知低层楼高为3m,那么这座楼高多少
问题描述：
一石子从高楼顶的边缘*下落,经过低层楼的时间为0.15s,已知低层楼高为3m,那么这座楼高多少
答
h=1/2gt^2h-3=1/2g(t-0.15)^2=1/2gt^2-35t^2-5(t-0.15)^2=3t^2-(t-0.15)^2=0.6(t+t-0.15)(t-t+0.15)=0.60.15*(2t-0.15)=0.62t-0.15=42t=4.15t=2.075h=1/2*gt^2=5*2.075^2=21.28125m