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Help with a problem?

  1. Nov 1, 2008 #1
    1. The problem statement, all variables and given/known data
    After a bobsled race, the sled and riders have been partially slowed down up in an icy incline, but they need to be brought to a stop. This happens on a portion of track inclined at 30 degrees that has a coefficient of kinetic friction of 0.60. The sled enters the incline at 25.0 m/s. How far does it travel along the incline before stopping?


    2. Relevant equations
    Ff=UFn
    Fn=mgcosO
    f=ma

    3. The attempt at a solution
    I couldn't find a way of doing it, since the , mass isn't given, maybe i'm overlooking something?
     
  2. jcsd
  3. Nov 1, 2008 #2

    HallsofIvy

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    Take any mass you like, say 100 kg. It should cancel out in the end.
     
  4. Nov 1, 2008 #3
    how would you set up the equation? and also im sort of clueless on how to find how far the sled goes... sorry.
     
    Last edited: Nov 1, 2008
  5. Nov 1, 2008 #4
    I got as far as finding the resultant force for the vectors, which i got was 2000N, but that's as far as i got.
     
  6. Nov 1, 2008 #5

    HallsofIvy

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    I think I would be inclined to use energy rather than force.
     
  7. Nov 1, 2008 #6
    ok so using the formula 1/2vi^2=FG(cos 30) d
    and solving for D, in which i got 88.28, would that be correct?
     
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