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Position of toy moving on straight track

  1. Oct 18, 2007 #1
    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
    [​IMG]

    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.
     
  2. jcsd
  3. Oct 18, 2007 #2

    learningphysics

    User Avatar
    Homework Helper

    The procedure you described should give you the answer... where did you get stuck?
     
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