1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook