1. The problem statement, all variables and given/known data A particle moving at 5 m/s reverses its direction in 1s to move at 5 m/s in the opposite direction. If is acceleration is constant, what distance does it travel? 2. Relevant equations The constant acceleration equations 3. The attempt at a solution I use x=vot + 1/2at2 were a= (vfinal- vinitial)/t. I get the wrong answer. Something about having to plug in half the time for some reason that I don't understand. Would some one please help me out?