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Homework Help: Rock climber

  1. Feb 19, 2009 #1
    1. The problem statement, all variables and given/known data

    A rock climber of mass 92.1 kg starts at the base of a cliff and climbs to the top (h = 33.8 m). He then walks along the plateau at the top for a distance of L = 289.9 m.

    (a) Find the work done by gravity.
    (b) What is the change in the gravitational potential energy of the rock climber.

    2. Relevant equations

    Im still learning this stuff and am clueless thus far.

    3. The attempt at a solution

    This is why i need help..

  2. jcsd
  3. Feb 19, 2009 #2


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    Science Advisor

    This problem is very similar to the others you have posted so far. Look at the solutions to those and you should be able to figure out this one.
  4. Feb 19, 2009 #3
    I'm trying. I understand PE=mgy but it just isnt working for me.
  5. Feb 20, 2009 #4


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    Science Advisor

    Consider the fact that that work can have a positive or negative sign, depending on if the force is working in the same or opposite direction of motion.
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