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Homework Help: Work Energy

  1. Oct 20, 2008 #1
    1. The problem statement, all variables and given/known data
    An outfielder throws a 2.01 kg baseball at a
    speed of 108 m/s and an initial angle of 11.9◦.
    What is the kinetic energy of the ball at the
    highest point of its motion? Answer in units
    of J.

    2. Relevant equations
    change KE=W
    R=Vi^2/g (sin2O)

    3. The attempt at a solution
    Found the range
    Plugged it into galileo's formula to find the acceleration
    found the force F=ma
    multipled by range
    Did I go about this correctly?
  2. jcsd
  3. Oct 20, 2008 #2


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    Homework Helper

    What they are basically asking for is what is the KE at max height.

    When the ball's flight is maximum, then all the vertical velocity is stored in potential energy. That leaves only the horizontal component of velocity needed to figure its mV2/2
  4. Oct 20, 2008 #3
    That means there would be no kinetic energy because of the conservation on energy?
  5. Oct 20, 2008 #4
    vox=vocosO =105.679m/s
    =11,223.9 J

    Thanks Lowlypion
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