The distance s in feet that an object falls (neglecting airresistance) in t seco

The distance s in feet that an object falls (neglecting airresistance) in t seconds is given by s=vt=16t2 where v is theinitial speed of the object in feet per second. An object isreleased from the top of a building 910ft high. The initial speedis the 18 ft/s air resistance is neglected. How many seconds laterwih the object hit the ground?