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Homework Help: Calculate the sprinters average acceleration

  1. Mar 31, 2008 #1
    1. The problem statement, all variables and given/known data
    A sprinter has a velocity of 6.0m/s at t=3.0s.
    Five seconds later he is moving north with a speed of 4.0m/s. calculate the sprinters average acceleration


    2. Relevant equations

    average acceleration=change in velocity/elapsed time

    3. The attempt at a solution

    t1=3.0s, v1=6.0m/s, t2=8.0s, v2=-4.0m/s
     
  2. jcsd
  3. Mar 31, 2008 #2

    Dick

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    Your velocities (and acceleration) are vectors. They have a direction. What's vf-vi if vf=4m/s [n] and vi=6m/s ?
     
  4. Mar 31, 2008 #3
    yeah i can jjust solve it, suppose i needed to change km/h/s to m/s^2
     
  5. Mar 31, 2008 #4

    Dick

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    I think you are thinking of a different problem. There's no km/hr in this one.
     
  6. Mar 31, 2008 #5
    Not sure how that relates to the question. They're already in standard units.
     
  7. Mar 31, 2008 #6
    yeah i know im just asking generally
     
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