Question 1060618
height=-9.8t^2+48t
25=-9.8t^2+48t
9.8t^2-48t+25=0, moving and checking signs.
t=(1/19.6)(48+/-sqrt(2304-980); sqrt (1324)=36.387
t=(11.613/19.6)=0.593 sec
t=84.387/19.6=4.305 sec
{{{graph(300,300,-2,6,-10,70,-9.8x^2+48x)}}}