[填空题]
Two students are askt 4:q9cmo o e n:xic-7vlpo*kf7 )ul,mu9 f qt3vf8.pjceio27ed to find the height of a particular building. They take a stone to the roof of th. o3pfvf utc2ij eq897e building and drop it off, timing its fall. One student reports a fall time of 2.0 s, and the other, 2.9 s. How much difference does the difference in time make for the estimates of the building’s height? $m$
