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Homework Help: Rather simple bouncing ball problem average acceleration

  1. Oct 9, 2004 #1
    I'm stuck on this rather simple problem...

    A golf ball released from a height of 1.4 m above a concrete floor bounces back to a height of 1.2 m. If the ball is in contact with the floor for .62 ms what is the average acceleration of the ball whil ein contact with the floor.

    I know that the two heights are given, h1 = 1.4, h2 = 1.2 and t = .00062 s for then the ball is in contact with the floor.

    In order to find the avg acceleration, I need to use change in v over change in time.

    I'm having a hard time figuring out the velocity of when the ball bounces back upto 1.2 m. Can anyone please help me figure out this problem?
     
  2. jcsd
  3. Oct 9, 2004 #2

    Tide

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    Use energy conservation to find

    [tex]v = \sqrt {2 g h}[/tex]

    after the bounce.
     
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