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Homework Help: Momentum and KE

  1. Nov 5, 2013 #1
    1. The problem statement, all variables and given/known data

    Can someone show me how equation 9.21 was derived?? I messed up on my calculations

    2. Relevant equations


    3. The attempt at a solution

    I dont know where i went wrong in terms of substituting 2 unknowns

    Attached Files:

  2. jcsd
  3. Nov 6, 2013 #2


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    Science Advisor
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    Multiply 9.20 by m1 and add 9.16. The v1f term disappears allowing you to solve for v2f. Similarly for solving for v1f.
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