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Intro Physics Question with too many unknowns?

  1. Sep 19, 2009 #1
    1. The problem statement, all variables and given/known data
    A race car with the weight of 10 000 kg is traveling at 10.0 m/s when it's gas runs out. How far will this race car travel till it reaches an absolute halt?


    2. Relevant equations

    F=ma
    v2^2-v1^2=2ad

    3. The attempt at a solution

    Fn= 490 000N
    v2^2-v1^2/2d= a

    and I tried to sub that for a in F=ma, but got no where =/
     
  2. jcsd
  3. Sep 19, 2009 #2
    You are not providing the enough information.
    1) What is the frictional force?
    - How you get frictional force provided that normal force is given?
    2) So what is retarding acceleration?

    Find that acceleration before doing anything. Don't try to solve it all in one single step.
     
  4. Sep 19, 2009 #3
    Hi, well we aren't given the coefficient of friction which makes this question ten times harder -.-
    Or I could have easily figured this out myself...
     
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