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Finding how long it takes given changing acceleration

  1. Sep 13, 2007 #1

    lim

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    1. The problem statement, all variables and given/known data
    At highway speeds, a particular automobile is capable of an acceleration of about 1.57 m/s2. At this rate, how long does it take to accelerate from 72.0 km/hr to 100.0 km/hr?


    2. Relevant equations

    I was given: vf = vi + at

    3. The attempt at a solution

    Simplifying the velocities I got 28 = 1.57a
    and a= 17.83 s.
     
  2. jcsd
  3. Sep 13, 2007 #2

    learningphysics

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    Homework Helper

    careful about units... convert km/hr to m/s or convert m/s^2 to km/hr^2...
     
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