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Homework Help: Ball Thrown

  1. Oct 13, 2008 #1
    1. The problem statement, all variables and given/known data
    A 0.20KG ball is thrown with a speed of 13 m/s at an angle of 32 degrees.

    What is the speed at the highest point?

    How high does it go? (Use conservation of energy, and ignores air resistance

    2. Relevant equations

    I think the kinematic equations but I am not sure.

    3. The attempt at a solution

    I was positive that the velocity of any projectile at the highest point would be zero, but this was not right in this problem. I think the problem has something to do with mechanical energy but I am not sure. Any suggestions for A? so that I can maybe find B.
  2. jcsd
  3. Oct 13, 2008 #2


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    Staff Emeritus
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    You're almost correct: the vertical component of the velocity will be zero at the highest point, but the horizontal component needn't be.
  4. Oct 13, 2008 #3


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    Homework Helper

    In projectile motion at the highest point one of the components speed will be zero, but remember one of components will have constant value. Projectile motion is a mix of free fall and constant velocity movements.
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