The formula to determine the height of the rocket above the ground at any time during the rocket's flight is given by:
h = 119t - 7t2 where t = the time, in seconds, that has elapsed since the rocket was launched, and h = the height, in meters, of the rocket above the ground at time t .
The value of h was 0 when the rocket hit the ground. How many seconds after the rocket was launched did it hit the ground?