Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Can someone help Very Easy

  1. Oct 11, 2008 #1
    1. The problem statement, all variables and given/known data
    A skier coasts down a very smooth, 10m high slope. If the speed of the skier on top of the slope is 5.0 m/s whats the speed at the bottom of the slope.

    2. Relevant equations

    3. The attempt at a solution

    I have to take gravity into consideration right?
  2. jcsd
  3. Oct 11, 2008 #2
    I would use conservation of energy

    KEi + PEi = KEf + PEf

    Does that help?
  4. Oct 11, 2008 #3
    I'm sorry but I cant seem to set this problem up, I have been doing this homework for 3 hours and this problem seems so easy. to Pe = mgy, but i have a brain fart on finding mass.
    Kinetic - energy of Motion (1/2mv^2). can yo walk me through it please
  5. Oct 11, 2008 #4
    You do not need the mass of the skier because it will cancel out of the equation.

    1/2mvi^2 + mgy = 1/2mvf^2

    The masses cancel out. You then have the initial velocity, the g, the y, and thus you should be able to solve for the final velocity. Now do you get it?
  6. Oct 11, 2008 #5
    yes thank you
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook