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Average Velocity for One Person's Trip

  1. Feb 3, 2016 #1
    1. The problem statement, all variables and given/known data
    A person runs 10.0m[E] in 2.0s, then 5.0m[E] in 1.5s, and finally 30.0m[W] in 5.0s. Find the person's average velocity.

    2. Relevant equations
    Vav= total displacement/total time

    Total displacement=df=di

    3. The attempt at a solution

    I found the total displacement to be 25m[W] and the total time to be 8.5s. Then, I used the formula to calculate average velocity, but my answer was different from the textbook's. I got 2.9m/s[W], but the answer in the book is 1.8m/s[W]. I don't know where I went wrong.
     
    Last edited by a moderator: Feb 3, 2016
  2. jcsd
  3. Feb 3, 2016 #2

    berkeman

    User Avatar

    Staff: Mentor

    Please show your detailed calculations so we can look for mistakes.
     
  4. Feb 3, 2016 #3
    I just redrew my diagram and realized that I calculated the displacement wrong. I got the right answer now. Thanks anyways!
     
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