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Late night sanity check (Average Acceleration)

  1. Sep 9, 2010 #1
    1. The problem statement, all variables and given/known data
    A car's velocity as a function of time is given by vx(t) = a + bt2, where a=3.00m/s and b=0.100m/s3. Calculate the average acceleration from interval t=0 to t=5.00s.


    2. Relevant equations
    Ave Acceleration = v2-v1/t2-t1



    3. The attempt at a solution
    After plugging in the numbers it's:

    (3+0.1t2)/5-0 =

    1.1m/s

    Which after 2 attempts online it's wrong. I even tried it with 1.10 to see if it picks up sig figs, but it's still wrong. Does it have something to do with m/s3?

    Thanks.
     
  2. jcsd
  3. Sep 9, 2010 #2
    Wow, that's embarrassing. After reading it over, I just realized that I was neglecting the v1 because it was at 0. Even though the "a" still have a value. Ahhh, gotta love the late nights.
     
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