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Quick Question about throwing a ball vertically

  1. Sep 21, 2011 #1
    If I were to throw a ball vertically upward, would the initial velocity of the ball be the same as the final velocity of my arm?
     
  2. jcsd
  3. Sep 21, 2011 #2
    if by final you mean the second the ball leaves your hand, yes
     
  4. Sep 21, 2011 #3
    Yes that is what I meant, thx.
     
  5. Sep 21, 2011 #4
    Maybe not so simple - a ball is compressible - so as you accelerate the ball you will compress the ball's side nearest your hand. As the ball leaves your hand your arm must have been decelerating - or presumably the ball wouldn't have left your hand. The question is what happened to the energy you used to compress the ball on acceleration - did it give a kick to the ball which was decompressing on launch or was it already recovered somewhere in your arm motion before the ball left your hand? I don't know :( Try with a softly inflated balloon to see if you can see or feel what happens on release.
     
    Last edited: Sep 21, 2011
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