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Uniform Acceleration-Algebraically

  1. Sep 30, 2011 #1
    b]1. The problem statement, all variables and given/known data[/b]

    An object was displaced 19.6 m east while uniformly accelerating from rest. If the average velocity of the object was 5.00 m/s east, what was the rate of acceleration?

    2. Relevant equations



    3. The attempt at a solution

    So my Vo=0
    Vf= 5.00m/s east
    x=19.6m

    I need to calculate acceleration. Which equation do I use and how would I manipulate it?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 30, 2011 #2

    gneill

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    Staff: Mentor

    What is the definition of average velocity? Can you extract a time from this definition and the given information?

    If you know the time and the distance traveled, do you know of a kinematic equation that relates them to the acceleration?
     
  4. Sep 30, 2011 #3
    I don't believe I can extract a time from the problem. I tried using Vf^2 = V0^2 + 2ax. I do not know how to isolate the a. Can you help? My average velocity is my final velocity in this problem, is that correct?
     
  5. Sep 30, 2011 #4

    gneill

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    Staff: Mentor

    You can extract a time. Go back to your notes and find the definition of average velocity.
     
  6. Sep 30, 2011 #5
    Average velocity is displacement/time. Would my time be 3.92s?
     
  7. Sep 30, 2011 #6

    gneill

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    Staff: Mentor

    You have the average velocity and you have the displacement....
     
  8. Sep 30, 2011 #7
    I still do not understand. I tried every equation and am not getting the answer
     
  9. Sep 30, 2011 #8

    gneill

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    Staff: Mentor

    Look at the definition for average velocity. Can you identify the time variable in the definition?
    Isolate the time variable in the equation.
     
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