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Homework Help: Constant Acceleration Distance

  1. Oct 8, 2008 #1
    1. The problem statement, all variables and given/known data
    Q1: A car accelerates uniformly from rest to a
    speed of 79.7 mi/h in 9.01 s.
    Find the constant acceleration (expressed
    in m/s2) of the car. Answer in units of m/s2.

    Q2: Find the distance (expressed in m) that the
    car travels during this time. Answer in units
    of m.

    2. Relevant equations

    3. The attempt at a solution
    79.7mi/h = 35.6m/s
    35.6/9.01 = 3.95m/s2

    3.95/2 * 9.01 = 17.79m
  2. jcsd
  3. Oct 8, 2008 #2
    Q1 looks fine to me, Q2 though, what formulae did you use?

    I would have used [tex] s = ut + \frac{1}{2} at^2 [/tex]

    where s = displacement
    u = initial velocity
    t = time
    a = acceleration

    This is the same as what you've done except your t is not squared.
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