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Gravity question

  1. Feb 14, 2010 #1
    Im just a little confused on a question dealing with gravity.

    ok so if i am standing on a roof and i throw a ball downwards with an acceleration

    the acceleration of the ball will be the acceleration i applied to it plus the acceleration of gravity correct?

    or is it just the acceleration of gravity because after i let go of the ball there is not force being applied to it which will therefore cause it not to accelerate faster than gravity.
     
  2. jcsd
  3. Feb 14, 2010 #2

    berkeman

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    Staff: Mentor

    Your last statement is the correct one.
     
  4. Feb 14, 2010 #3
    You do accelerate the ball with your hand before you let go, giving it a certain velocity, but once it's left your hand, the only acceleration is due to gravity (ignoring slight resistance from the air).
     
  5. Feb 14, 2010 #4
    Thanks :)
     
  6. Jul 30, 2011 #5
    Yep. The force that you apply acts only for that instant of time when you interact with the body. After that, it's all up to gravity to do it's job ;)
     
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