1. The problem statement, all variables and given/known data A particle leaves its initial position x_0 at time t=0 moving in the positive x direction with speed v_0 but undergoing acceleration of magnitude a in the negative x direction. Find expressions for (a) the time when it returns to the position x_0. 2. Relevant equations v=v_0-at x=x_0+v_0*t 3. The attempt at a solution i know that v=v_0, but that gives me a time of 0, which doesn't make sense. i'm also not supposed to use x_0 in the solution. otherwise, i think the solution should be (v-v_0)/-a.