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: Simple derivation for elastic collisions, where is my mistake?

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


    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


    User Avatar
    Homework Helper
    Gold Member
    2017 Award

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