1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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

    3. The attempt at a solution

    v2=508m/s [fwd]
    v1=204m/s [fwd]


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

  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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook