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Homework Help: Completely Inelastic Collision Question

  1. Nov 20, 2008 #1
    1. The problem statement, all variables and given/known data
    In the question that we were given it states that the resulting collision is a completely inelastic collision. Then it asks us to solve for the momentum and kinetic energy.

    For the momentum part I have already solved it and have values for final and initial velocities that I know are right. What I don't understand however is how we are supposed to find the change in kinetic energy here because the only formula I could find for "completely inelastic collisions" was ΔEk = max value.

    My question is, what would the "max value" equal to (or represent) in the equation ΔEk = max value?

    Ma = 1.0
    Ma = (1/2)Mb
    Via = 5.0m/s
    Vib = 0m/s
    Vf = 5.0/3.0 m/s (found through momentum calculations)

    2. Relevant equations
    Δp = 0
    ΔEk = max value

    3. The attempt at a solution
    Last edited: Nov 20, 2008
  2. jcsd
  3. Nov 20, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The change in KE is simply the final KE (calculate it) minus the initial KE (calculate it).
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