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Homework Help: Find frictional force from mass and acceleration

  1. Nov 30, 2008 #1
    1. The problem statement, all variables and given/known data

    Acceleration of a car is -12.2 m/s/s. The car has a mass of 925 kg. Find the frictional force.

    3. The attempt at a solution

    So A=-12.2, M=925 kg

    = -11285 N

    =9065 N

    Since there is no vertical direction, Fg=Fnorm.

    Now I have the equation Ff(frictional force= coefficient(normal force)

    I'm really stuck here. I need to know the Fa or the coefficient to solve?
  2. jcsd
  3. Nov 30, 2008 #2
    If that's the whole questions then Fnet=Ff=ma

    so you got it..
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