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Homework Help: Terminal speed of baseball

  1. Oct 11, 2009 #1
    1. The problem statement, all variables and given/known data
    A baseball is thrown straight up. The drag force is proportional to v^2.
    In terms of g , what is the y-component of the ball's acceleration when its speed is half its terminal speed and it is moving up? moving back down?

    2. Relevant equations
    F=ma
    mg+bv^2=ma
    mg-Bv^2=ma

    3. The attempt at a solution
    been trying to start it but I just don't see how.
     
  2. jcsd
  3. Oct 11, 2009 #2
    What is the acceleration "a" when the object is at terminal velocity?

    Using your equations, what is the terminal velocity in terms of m, g, and b?

    Now, what is "a" when you cut "v" in half?
     
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