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Homework Help: Physics Exam question

  1. Jun 7, 2009 #1
    1. The problem statement, all variables and given/known data
    2 balls fall from a given height. 1 ball is smaller than the other and the mass of the bigger ball is given. The larger ball is directly below the smaller ball when dropped and the seperation is distance is negligible. When the larger ball hits the floor, the smaller ball collides with the larger ball. What is the mass of the smaller ball if it prevents the larger ball from bouncing back up (it remains at rest on the floor)?

    2. Relevant equations

    Kinetic energy, conservation of energy

    3. The attempt at a solution

    The mass of the smaller ball is equal to that of the larger ball.
    I am not sure of this answer though
  2. jcsd
  3. Jun 7, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Show how you arrived at this answer. Hint: What's conserved?
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