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Homework Help: Physics homework -- guy runs 28.5m in 11.5s,

  1. Dec 18, 2014 #1
    1. The problem statement, all variables and given/known data
    I have a problem where a guy runs 28.5m in 11.5s, waits 45s, then runs back to the starting point in 22s. What's the average velocity?

    2. Relevant equations

    3. The attempt at a solution
    Would it be zero because the displacement is zero or would I calculate the 57 total meters ran divided by the overall time?
  2. jcsd
  3. Dec 18, 2014 #2


    Staff: Mentor

    Welcome to PF!

    What is the definition of average velocity? Its based on displacement and time so what is it?
  4. Dec 19, 2014 #3
    Hi Daniel! Welcome to physics forum!:)
    The question asks to find the average velocity not average speed. Your answer is correct. As displacement is zero so average velocity is zero. But average speed is not zero.
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