# Help with a problem?

## 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?

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

HallsofIvy
Science Advisor
Homework Helper
Take any mass you like, say 100 kg. It should cancel out in the end.

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:
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.

HallsofIvy
Science Advisor
Homework Helper
I think I would be inclined to use energy rather than force.

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?