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Momentum of 15 ton train

  1. Nov 12, 2007 #1
    1. The problem statement, all variables and given/known data

    What speed must a 15 metric ton train travel to have a momentum of 700,000 kg(m/s)?


    2. Relevant equations

    Momentum = mass X velocity

    change in momentum = mass(Finalvelocity - initialvelocity)

    3. The attempt at a solution

    I though you did it like this...

    15 metric tons= 15,000 kg

    so 700,000=15,000V

    V=46.6 m/s
     
  2. jcsd
  3. Nov 12, 2007 #2

    Kurdt

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    That looks ok to me. Except if you report the answer to one decimal place you'll have to round it up.
     
  4. Nov 12, 2007 #3
    Well see thats the problem, my teacher is having us enter our answers on to a university of Texas homework service site thing. So to help us not enter all wrong answers and get a horrible grade, he gave us a "range" for the answers of each problem, for that problem it says the answer is "a small positive integer 1-10"
     
  5. Nov 12, 2007 #4

    Kurdt

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    Well the only thing i can suggest is that there is a typo somewhere. I assume you've checked the units it has to be entered in and everything.
     
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