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Homework Help: Average Velocity

  1. Sep 8, 2008 #1
    When calculating an average velocity in a problem containing multiple velocities each occuring for different lengths of time, would I be correct in calculating the total displacement and then dividing by the total time?

    For example:
    Suzy goes for a jog one day. She runs at an average velocity 3 m/s north for 2 minutes and then an average velocity of 5m/s south for 3 minutes. What is her average velocity?
    I believe it would be solved like this:

    d=vt = (3m/s)(120s) =360m
    d=vt = (-5m/s)(180s)=-900m

    total d = 360m + (-900m) =-540m
    total t =300s

    Average V = -540m/300s = -1.8m/s

    Thank you.
  2. jcsd
  3. Sep 8, 2008 #2


    User Avatar
    Homework Helper

    Welcome to PF.

    Velocity is treated as a vector and that's right.
    Average speed would have been different, but I think you know that already.

    Good luck.
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