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Simple derivation for elastic collisions, where is my mistake?

  1. Nov 14, 2012 #1
    1. The problem statement, all variables and given/known data

    http://postimage.org/image/j2ccrtjp1/

    Here is a scan of my work. The problem is on the scan. Just trying to derive the velocity of the target in an elastic collision, as sketched in the image...

    Can't seem to find the problem for the life of me.
     
  2. jcsd
  3. Nov 14, 2012 #2

    TSny

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    Homework Helper
    Gold Member

    Your work looks good and the expression you derived for u2 is correct! :smile: You just didn't give the correct expression for what you claim the answer should be.

    Usually people are more interested in writing the answer for u2 in terms of the initial velocity v1 rather than the final velocity u1.
     
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