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Homework Help: Physics Homework help please!

  1. Sep 21, 2010 #1
    1. The problem statement, all variables and given/known data

    After falling from rest from a height of 34 m, a 0.47 kg ball rebounds upward, reaching a height of 24 m. If the contact between ball and ground lasted 1.8 ms, what average force was exerted on the ball?


    2. Relevant equations

    vf^2=2gh

    vf=sqrt 2gh.

    force*time=2sqrt(2gh)


    3. The attempt at a solution

    i have tried to plug in but i cannot seem to get it correct. help please!
     
  2. jcsd
  3. Sep 21, 2010 #2

    Delphi51

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    Homework Helper

    Look up the concept of "impulse" in your text book or Wikipedia. The impulse formula will make short work of this problem!
     
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