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Homework Help: Forces in 2 dimensions help

  1. Oct 3, 2007 #1
    The question is:
    The driver of a car whose weight is 13000 Newtons traveling at 108km/hr slams on the brakes in order to undergo a constant acceleration, skidding to a complete stop in 4.5 seconds.
    What is the average force that the brakes must exert during braking?

    So far i have the acceleration (-200m/sec) and the mass (1326.5kg) I'm not sure if those are right, but besides that I am at a loss at what to do next.
  2. jcsd
  3. Oct 4, 2007 #2


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    Homework Helper

    Welcome to PF! :smile:

    1. Show us how you arrived at the value for acceleration (though you used units of velocity)

    2. Which of Newtons's laws might be applicable here?
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