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Work and Energy of a softball

  1. Mar 17, 2009 #1
    002 (part 1 of 4)
    You throw a softball (of mass .350 kg) straight
    up into the air. It reaches amaximum altitude
    of 5.8 m and then returns to you.
    What is the gravitational potential energy
    of the softball at its highest position? Assume
    the ball departed fromand returned to ground
    level. Answer in units of J.
    003 (part 2 of 4)
    Assume no energy is lost by the softball while
    it is in the air.
    What is the kinetic energy of the softball as
    soon as it leaves your hand? Answer in units
    of J.
    004 (part 3 of 4)
    What is the kinetic energy of the softball when
    it returns to your hand? Answer in units of
    J.
    005 (part 4 of 4)
    What is the speed of the ball? Answer in
    units of m/s.

    2. Relevant equations
    PE=massxgravityxdisplacement
    KE=1/2xmassxvelocity(squared)
    TE=PE+KE

    3. The attempt at a solution

    I solved for the first problem getting 19.894 Joules, but I ma having trouble solving for the second part. I can't seem to find the total energy.
     
  2. jcsd
  3. Mar 17, 2009 #2
    Things fly when you provide them energy. In ideal situations, they reach their maximum height when all initial energy is converted into potential energy. So, you know the initial kinetic energy you provided to it.

    Is this advanced physics question btw?
     
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