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Homework Help: Need a bit of help with j-hat and i-hat in a collision

  1. Feb 29, 2004 #1
    Hey there, I'm lost with this one:


    Now, I know how to go about calculating the velocity of the center of mass (v(cm)= m(1)V(1)+m(2)V(2)/m(1)+m(2)

    The thing that throws me off is the j-hats and i-hats. How do I come out with a vector number? I thought of the pothagarem(sp?) therom, but decided that couldnt work. Any ideas? Thanks.
     
  2. jcsd
  3. Feb 29, 2004 #2
    u mean pythagoras Theorem , it should work
     
  4. Mar 1, 2004 #3

    HallsofIvy

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    Science Advisor

    Treat "i-hat" and "j-hat" as two separate problems. Then put them back together into the "momentum vector" with i and j components.
     
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