(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A 64.9-kg skier coasts up a snow-covered hill that makes an angle of 23.4 ° with the horizontal. The initial speed of the skier is 8.95 m/s. After coasting a distance of 2.31 m up the slope, the speed of the skier is 4.40 m/s. (a) Find the work done by the kinetic frictional force that acts on the skis. (b) What is the magnitude of the kinetic frictional force?

http://edugen.wiley.com/edugen/courses/crs2216/art/qb/qu/c06/EAT_12258936060120_435296769488702.gif

2. Relevant equations

W=FX 2K=mv^2 a=(v^2-v0^2)/2x

3. The attempt at a solution

for (b) i used f=ma-mg sinθ,

or 1/2mv^2-1/2mv0^2-mgxsinθ for (a),

but neither was right...

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# Homework Help: Kinetic frictional force

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