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Homework Help: Physics 12 help please

  1. Jul 4, 2010 #1
    1. The problem statement, all variables and given/known data

    a car accelerates in a straight line from rest ot a velocity of 80km/h in a time of 6s

    2. Relevant equations

    what is the acceleration of the car?
    how far did the car travel in this time?

    3. The attempt at a solution
    Now I am trying to convert 80km/h to m/s, so that equals 22.22m/s. I am doing this as an online course and I cant find a formula? Can someone help me please?
  2. jcsd
  3. Jul 5, 2010 #2
    1km/hour = 1000m/3600secs = 1/3.6m / s. This means, that to get m/s from km/hour, you just need to divide it by 3.6.
    Acceleration a = dv / dt, both of which you know.
    And as for how far did the car travel, s=(a/2)*t^2, since it's from resting. Those are the formulas you need.
  4. Jul 5, 2010 #3


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    The course does not provide any reference or study material containing formulas? Sounds like you are wasting your money, if you are paying.
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