An Object Is Thrown Upward From The Top Of A 260 Ft Tall Building With An Initia

An object is thrown upward from the top of a 260 ft tall building with an initial velocity of 64 feet per second. The height “h” of the object after “t” seconds is given by the quadratic equation h= -16t^2 + 64t + 260. How long will it be before the object hits the ground?