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Homework Help: Oblique Collision Between Two Spheres : Incomplete info?

  1. Jun 3, 2012 #1
    Two smooth spheres of masses 4 kg and 2 kg impinge obliquely.
    The 2 kg mass is brought to rest by the impact.
    (i) Prove that, before impact, they were moving in directions perpendicular to each other.
    (ii) Show that, as a result of impact, the kinetic energy gained by the 4 kg mass is equal to half that lost by the 2 kg mass.

    I'm having trouble proving the first part because to prove it i'd need to show that e = 1/2 however no value of e is given. Is this possible to solve or is the information incomplete?
  2. jcsd
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