1. The problem statement, all variables and given/known data An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time. Determine the acceleration of the object during this motion. x = 80m t = 5.0 second v = + 20m/s a = while in motion 2. Relevant equations 80 m = 100 m + 1/2 a 25 s2 -1.6 m/s2 3. The attempt at a solution Supppos to be positive I don't know why I get negative acceleration?