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Homework Help: Record travel along a straight path

  1. Sep 18, 2012 #1
    1. The problem statement, all variables and given/known data

    A record of travel along a straight path is as follows:
    1. Start from rest with constant acceleration of 2.20 m/s2 for 15.0 s.
    2. Maintain a constant velocity for the next 1.65 min.
    3. Apply a constant negative acceleration of −9.92 m/s2 for 3.33 s.
    (a) What was the total displacement for the trip? m
    (b) What were the average speeds for legs 1, 2, and 3 of the trip, as well as for the complete trip?
    leg 1 m/s
    leg 2 m/s
    leg 3 m/s
    complete trip m/s

    2. Relevant equations

    delta X = Vi t + 1/2 a t^2
    Vf^2 = Vi^2 + 2 a (delta X)

    3. The attempt at a solution

    I'm sure how to tackle this, but here was my attempt.
    delta X = (0)(15) + 1/2(2.20)(15^2) = 247.50
    I'm kind of stuck at this point, I don't know what to do?!
  2. jcsd
  3. Sep 18, 2012 #2
    Can't you do the same for leg 3 as you did for leg 1? As they are pretty much the same, only the acceleration is now the other way around.
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