posted by Anonymous .
Jan is standing on a roof of a building. She launches a water balloon upward at an initial speed of 44 feet per second at height of 20 feet. How long will it take before the balloon lands on the ground? Round to the nearest tenth of a second.
the height h of the balloon above the ground is given by
h(t) = 20 + 44t - 16t^2
set h=0 and solve for t