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Help with physics homework

  1. Oct 3, 2012 #1
    1. The problem statement, all variables and given/known data
    A 2,254-kg car is moving down a road with a slope of 10 degrees while speeding up at a rate of 1.1 m/s^2. What is the direction and magnitude of the frictional force?
    (define positive in the forward direction, i.e., down the slope)?


    2. Relevant equations
    ax=μgcos-gsin


    3. The attempt at a solution
    μ=ax/gcos-gsin 1.1m/9.81(cos10-sin10)=0.138 i keep on getting this answer.
     
  2. jcsd
  3. Oct 3, 2012 #2
    I think it would be useful if you provided more details about your attempt. For starters, what does the free body diagram look like?
     
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