Question 1034472
The ball has to drop 28 meters and h(t) must be 12 feet.
h(t)=12=-2t^2-10t+40
-2t^2-10t+28=0
divide everything by minus 2
t^2+5t-14=0
(t+7)(t-2)=0
positive root only.  t=2 seconds.At that point, h(t)=12.
{{{graph(300,200,-5,5,-20,50,-2x^2-10x+40)}}}