An object is dropped from 33 feet below the tip of the pinnacle atop a 357-ft tall building. The height h...

An object is dropped from 33 feet below the tip of the pinnacle atop a 357-ft tall building. The height h of the object after t seconds is given by the equation h = -16t^2 + 324. Find how many seconds pass before the object reaches the ground.
seconds pass before the object reaches the ground (Type an integer or a decimal.)