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What is the speed with kinetic energy

  1. Jan 29, 2009 #1
    1. The problem statement, all variables and given/known data
    What is the speed of a 0.145 kg baseball if it's kinetic energy is 105 J? Answer units in of m/s

    2. Relevant equations
    kinetic energy = 1/2mv^2

    3. The attempt at a solution
    105= 1/2(0.145)v^2
    105= .0725v^2
    v= 36.06
  2. jcsd
  3. Jan 29, 2009 #2


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    Homework Helper

    What seems to be the problem? I would check that arithmetic again, with a calculator if possible.
  4. Jan 29, 2009 #3
    Agreed, check your numbers.
  5. Jan 29, 2009 #4
    Well it's an online assignment so it imediantly tells me if i am right or wrong... I did it with a calculator several times.... What am I doing wrong?
  6. Jan 30, 2009 #5
    Use your answer, plug it back into the KE equation, and tell us what you get. You might find a 10 percent error.
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