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Homework Help: Elastic Collisions between two objects

  1. Feb 3, 2016 #1
    1. The problem statement, all variables and given/known data
    You have an inertia of 52 kg and are standing at rest on an iced-over pond in your skates. Suddenly, your 60-kg brother skates in from the right with x component of velocity -4.9 m/s and collides elastically with you.

    1. What is the siblings' relative speed after the collision?

    2. Relevant equations

    3. The attempt at a solution
    This is part of my assignment online, and it when I plug in 4.55 m/s it says my answer is incorrect. I'm lost at this point.
    Thanks in advance!
  2. jcsd
  3. Feb 3, 2016 #2


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    Homework Helper

    Has the above equation any information? It is a trivial identity.

    Relative with respect what?
    The question is the relative speed of you and your brother after the collision.
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