A skydiver jumps from an airplane at an altitude of 2 500 ft He falls under the force of gravity until he opens his parachute at an altitude of 1 000 ft Using the initial velocity of zero approximately how long does the jumper fall before he opens his chute For this quadratic model we will let the y axis be the axis of symmetry h t 16t2 vt ho 9 7 s 2 4s 12 5 s 14 8 s