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Projectile kinetic energy

  1. Aug 13, 2014 #1
    1. The problem statement, all variables and given/known data
    Solved


    2. Relevant equations


    3. The attempt at a solution
    Solved
     
    Last edited: Aug 13, 2014
  2. jcsd
  3. Aug 13, 2014 #2

    Nathanael

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    The ball has some kinetic energy at it's maximum height which you've neglected.

    Edit:
    I said you would be right if it was launched straight up, but that's not true. Sorry, I'm tired.
    (If it was launched straight up you would use 8.2m for "h" not 12.9m)
     
    Last edited: Aug 13, 2014
  4. Aug 13, 2014 #3
    v=47.6 m/s
    Is that the right answer???
    calculate vertical component and horizontal component separately.
     
    Last edited: Aug 13, 2014
  5. Aug 13, 2014 #4

    Nathanael

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    Yes.
     
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