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Is my teacher's work for collisions problem correct?

  1. Jun 9, 2015 #1
    1. The problem statement, all variables and given/known data
    The problem and solution is here: http://nebula.deanza.edu/~newton/4A/4AE2P3Winter10.jpg .

    2. Relevant equations

    The equations are in that link.

    3. The attempt at a solution
    My question is how do you know that the final velocities of both masses are equal to each other? wouldnt that ONLY be hte case if the collision was perfectly inelastic (which he didnt mention).
     
  2. jcsd
  3. Jun 9, 2015 #2

    haruspex

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    I agree.
     
  4. Jun 9, 2015 #3
    alright, and in this case it would be simply impossible for the masses to have the same velocity.... because the first mass (the mass on the left) would move left after the collision correct?
     
  5. Jun 9, 2015 #4
    nevermind scratch that.... that would only happen if it is an elastic collision.... this may or may not happen in an inelastic collision
     
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