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Homework Help: Find the displacement in a word problem

  1. Feb 23, 2014 #1
    1. The problem statement, all variables and given/known data
    A car is slowing down at a rate of 20 km/h/s. How far does it travel if its original velocity is 50 km/h and its final velocity is 5.0 m/s?

    2. Relevant equations

    vf2 = v02 + 2aΔx

    3. The attempt at a solution

    vf2 = v02 + 2aΔx
    Δx = (vf2 - v02) / 2a
    = (182-502) / 2(-20)
    = -2176 / -40
    = 54.4 m

    That's wrong, though. The answer should be 15 m.
  2. jcsd
  3. Feb 23, 2014 #2
    Whoops, forgot to convert km/h/s to km/h/h. I got the answer now :)

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