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Homework Help: Constant Acceleration

  1. Jan 16, 2009 #1
    1. The problem statement, all variables and given/known data

    If a car cruises at 11.3m/s for 75s, then uniformly speeds up until, after 45s, it reaches a speed of 18.5 m/s, what is the car's displacement during this motion?

    2. Relevant equations

    v(1)=at+v(o)
    v^2=v(o)^2 +2a(x-xo)

    3. The attempt at a solution

    V(o)=11.3
    V(1)=18.5
    t=45

    a=7.2/45=.16

    so by plugging in all this values into v^2=v(o)^2 +2a(x-xo) i get 670.5m

    But they are telling me the answer is 1.52km
     
  2. jcsd
  3. Jan 16, 2009 #2
    nm solved it.. its asking for the displacement of the whole trip..

    man i hate how the questions are worded in a tricky way.
     
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