Help with a problem?

  • Thread starter choyphin
  • Start date
  • #1
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Homework Statement


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?


Homework Equations


Ff=UFn
Fn=mgcosO
f=ma

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?
 

Answers and Replies

  • #2
HallsofIvy
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Take any mass you like, say 100 kg. It should cancel out in the end.
 
  • #3
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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:
  • #4
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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.
 
  • #5
HallsofIvy
Science Advisor
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I think I would be inclined to use energy rather than force.
 
  • #6
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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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