A rocket is fired upward from some initial distance above the ground. Its height in feet, h, above the ground, t seconds after it is fired, is given by h = -16t + 240t + 1216. b What is the maximum height (in ft.)? 7.5 ft How long does it take for the rocket to reach its maximum height? t =_ After it is fired, the rocket reaches the ground at t = sec. sec.