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Displacement question

  1. Sep 12, 2007 #1
    Hi there, I'm having a problem with this question, it seems like I'm doing everything perfect but still getting the wrong answer:
    1. The problem statement, all variables and given/known data
    During a 29.4-s interval, the velocity of a rocket changes from 204m/s [fwd] to 508m/s [fwd]. Assuming constant acceleration, determine the displacement of the rocket during this time interval.


    2. Relevant equations
    d=1/2(v1+v2)t


    3. The attempt at a solution

    t=29.4s
    v2=508m/s [fwd]
    v1=204m/s [fwd]
    d=?

    d=1/2(204+508)x29.4
    =4,468.8m

    This answer is wrong, the correct answer (based on the book) is 10500m [fwd]

    THANKS!
     
  2. jcsd
  3. Sep 12, 2007 #2
    When I evaluate d=1/2(204+508)x29.4, I get 10500. (actually, 10466.4; rounded to 3 significant digits, it agrees) Your problem is apparently a calculator mistake - either hit a wrong button or you aren't typing it in correctly.
     
  4. Sep 12, 2007 #3
    Ya, I just re-did it, I got the correct answer, which is weird, because I re-tryed it 3 times and still got 4,468.8m, but suddenly I get 10500! I hate mistakes like this, it drives me crazy for no reason. THANKS for the quick reply! I can now stop being frustrated.
     
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