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Homework Help: Finding acceleration using velocity

  1. Sep 13, 2011 #1
    1. The problem statement, all variables and given/known data


    A race car starts from rest and travels east along a straight and level track. For the first 5.0 s of the car's motion, the eastward component of the car's velocity is given by vx(t)=(0.940 m/s3)t2
    2. Relevant equations

    I think I am suppose to use the equation x-x0=(v0+v)/2)t

    3. The attempt at a solution

    I know the givens are x0=0 and t=5.00s, but I don't know how to use vx to solve for acceleration. Thanks.

    You guys didn't happen to obtain7.46 m/s^2 as the answer, did you?
     
    Last edited: Sep 13, 2011
  2. jcsd
  3. Sep 13, 2011 #2

    ehild

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    Homework Helper

    No, that relation is valid between displacement and velocity for a special kind of motion, what is it? Is it the same as the motion in the problem?

    Do you need to get the displacement or the acceleration?


    Hint: how is velocity and displacement related in general? How is acceleration defined?

    ehild
     
  4. Sep 13, 2011 #3
    ok thanks! I just figured it out. =)

    the answer is 7.46 m/s^2.
     
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