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Homework Help: Physics ball speed problem

  1. Jan 6, 2009 #1
    1. The problem statement, all variables and given/known data
    A pitcher rotates a 2kg ball around a verticle circular path of radius 1.2m. he exerts a 50N force directed parallel to the motion of the ball around the completer circular path. The speed of the ball at the top of the circle is 20m/s. If the ball is released at the bottom of the circle, what is the speed upon release?

    2. Relevant equations
    KEi+PEi = KEf+PEf

    3. The attempt at a solution
    wd = Fd
  2. jcsd
  3. Jan 6, 2009 #2


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    Homework Helper

    Can you explain what you wrote under "3. The attempt at a solution".
    What does that formula give you? Why is it useful?
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