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Free Fall Acceleration

  1. Sep 17, 2007 #1
    if a 2 kg ball is thrown upward at a speed of 22.2 m/s and it hits the ground after 4.10 s, can I use this information to find out when and where it is at the apex? Does the mass come into play, or is it the same for all objects?

  2. jcsd
  3. Sep 17, 2007 #2


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    Mass doesn't matter. It's the same for all objects. You can solve the problem purely kinematically, ie you don't use the mass at all.
  4. Sep 17, 2007 #3
    Thanks, How would I do this?
  5. Sep 17, 2007 #4


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    You can find the time to reach the apex immediately. What do you know about the velocity at the apex?

    Once you know the time to reach the apex, try to use that to find the height of the apex... there are a couple of different ways to do this.
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