1. The problem statement, all variables and given/known data determine the stopping distance for a car with an intitial speed of 26.9 m/s and a human reaction time of 0.9s for an acceleration of -4m/s^2 2. Relevant equations x=vt t=v/a x=x+vt+.5at^2 3. The attempt at a solution I used the second equation to find total time by adding it to .9s then plugged that into equation 3 and added that to x of the first equation?? what am i doing wrong??