[填空题]
Two students are asked to find the height 2jujfv0/t+uzmnwn88i-o y ;ce 0hrt- of a particular building. They t ;-rw3, c/;/( lnnht5bpzdvm hye q4yyake a stone to the roof of the 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 differ-/5(qv 4hh/d bwcn3ptyr,znye;;m l y ence does the difference in time make for the estimates of the building’s height? $m$
