1. The problem statement, all variables and given/known data A football is kicked straight into up into the air; it hits the ground 5.2s later. What was the greatest height reached by the ball? Assume its kicked from ground level. With what speed did it leave the kicker's foot? 2. Relevant equations xf=xi + (vx)i + 1/2Ax(t)^2 3. The attempt at a solution I tried to solve by using the above formula, but had nothing to plug in for velocity, I know that g=9.8m/s, and I believe that that -g would be the acceleration of the object, but I am unsure of how to progress in the problem. Any help would be greatly appreciated!