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Homework Help: Non-elastic collision without outside influence

  1. Mar 1, 2012 #1
    A ball A of mass makes a head-on elastic collision with a second ball B (at rest) and rebounds in the opposite direction with a speed equal to one-fourth its original speed. What is the mass of the second ball B?

    I think an appropriate equation for this is v(1)= u(1)*(m(1)-m(2))/(m(1)+m(2))

    I tried solving this by changing v(1) to 1/4 u(1) and then trying to find something that makes that long equation next to u(1) equal 1/4 but I can't seem to find anything
  2. jcsd
  3. Mar 1, 2012 #2


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    Staff: Mentor

    Hi nhmockus, welcome to Physics Forums.

    Remember that velocities have directions.
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