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Confusion with acceleration

  1. Jun 16, 2007 #1
    I'm confused with this problem:

    A baseball is thrown straight upward. What is the ball's acceleration at its highest point?

    I think that it would be gravity but its speed is 0 right?

    When problems say that a ball is thrown up with an acceleration of 3 m/s^2, does the acceleration magnitude already include that of gravity? Because if not, wouldn't you need to subtract the 10m/s^2 of acceleration of gravity too?
  2. jcsd
  3. Jun 16, 2007 #2

    Doc Al

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    Staff: Mentor

    So? What does the ball's speed have to do with its acceleration?

    Once the ball leaves your hand, the only force on it is gravity (ignoring air resistance) and thus its acceleration is g downward.

    While the ball is in your hand you can push on it, giving it an upward acceleration.
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