[填空题]
Two students are asked to find the huwpifm7;4a(+rnd 1 djjb5 z y0rb; r.xmth-mo+wel) +eight of a particular building. They take a stone to the roof of the building and drop it off, timing its fall. One student rez r+mr ;whtmj5-x)+obel0 . ybports 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? $m$
