Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. a rocket is launched from atop a 99-foot cliff with an initial velocity of 122 ft/s. a. substitute the values into the vertical motion formula h=-16t^2+vt+c . let h = 0. b. use the quadratic formula find out how long the rocket will take to hit the ground after it is launched. round to the nearest tenth of a second.0= -16t + 122t  +99;   8.4 s0= -16^2 + 99t + 122;   0.7 s0= -16t^2 + 99t + 122; 8.4 s0= -16t^2 + 122t + 99; 0.7 s