1. The problem statement, all variables and given/known data The position of a toy locomotive moving on a straight track along the x-ais is given by the equation x = t^6 - 6t^2 + 9t where x is in meters and t is in seconds. The net force on the locomotive is equal to zero when t is equal to _______? Answer in units of s. 2. Relevant equations x = t^6 - 6t^2 + 9t http://www.glenbrook.k12.il.us/gbssci/phys/Class/1DKin/U1L6a1.gif [Broken] 3. The attempt at a solution I tried to get the acceleration equation by taking the second derivative of the position equation, setting it to zero, and solving for t... but doesnt look right.