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Acceleration question (should be easy?)

  1. Sep 14, 2015 #1
    1. The problem statement, all variables and given/known data
    A person runs in front of you. The person accelerates uniformly from 4.0 m/s to 8.0 m/s in a time of 4.0 s.
    What is the magnitude of the acceleration of the person during the 4.0 s?

    2. Relevant equations
    Kinematics

    3. The attempt at a solution
    Vfx = Vox + at
    (Vfx - Vox)/t = a

    so (8m/s - 4m/s)/(4s) = a = 1.0 m/s^2

    this is wrong though, so what am i failing to understand here?
     
  2. jcsd
  3. Sep 14, 2015 #2

    andrewkirk

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    It looks right to me. Does the book give a reason for its answer? Perhaps the book's answer is wrong - they sometimes are.
     
  4. Sep 14, 2015 #3
    apparently it should be 0.8 m/s^2 ?
     
  5. Sep 14, 2015 #4

    andrewkirk

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    Check the problem statement. Perhaps the time was 5s, not 4.
     
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