The height of a projectile launched upward at a speed of (32feet )/(second) from a height of 128 feet is given by the function h(t)=-16t^(2)+32t+128. How long will it take the projectile to hit the ground? The height of an object dropped from the top of a 144-foot building is given by h(t) = -16t^2 +144. How long will it take the object to hit the ground?