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Skier coasts down hill speed at bottom?

  1. Sep 27, 2009 #1
    Hello! Just wondering if anyone could point me in the correct direction with these problems?

    1. The problem statement, all variables and given/known data
    "A skier coasts down a very smooth, 10 m high slope. If the speed of the skier on the top of the slope is 5.0 m/s, what is his speed at the bottom of the slope?"

    and...

    "If the skier has a mass of 60 kg, and the force of friction retards his motion by doing 2500 J of work, what is his speed at the bottom of the slope?"


    I just can't seem to figure out what equation to use to figure this out.
    Help!

    Thanks SO much!
     
  2. jcsd
  3. Sep 27, 2009 #2

    mgb_phys

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    Science Advisor
    Homework Helper

    welcome to pf.
    At the top of the hill the skier has kinetic and potential energy - at the bottom he has just kinetic - since no energy is lost these are equal.
    what are the equations for KE and PE?
     
  4. Sep 27, 2009 #3
    thank you!

    the equations are...

    KE= 1/2mv^2
    PE= mgy
     
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