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Homework Help: Help solve all this question please

  1. Jun 27, 2013 #1
    help solve all this question please...:(

    A uniform smooth sphere P,of mass 3m, is moving in a straight line with speed u on a smooth horizontal table.Another uniform smooth sphere Q, of mass and m and having the same radius as P, moving with speed 2u in the same straight line as P but in the opposite direction to P. The sphere P collides with the sphere Q directly. The velocities of P and Q after the collision are v and w respectively, measured in the direction of motion of P before the collision. The coefficient of restitution between P and Q is e.

    a) Find an expression for v in terms of u and e.
    b) Show that, if the direction of motion and P is changed by the collision, then e>1/3.
    c) Find an expression for w in terms of u and e.

    Following the collision with P, the sphere Q then collides with and rebounds from a vertical wall which is perpendicular to the direction of motion of Q. The coefficient of restitution between Q and the wall is e'

    Given that e=5/9, and that P and Q collide again in the subsequent motion,
    e) Show that e'>1/9.
  2. jcsd
  3. Jun 27, 2013 #2
    Do you know any equations that may help?
  4. Jun 27, 2013 #3
    this is the prove question...i dont know wht equation can solve :(
  5. Jun 27, 2013 #4
    Can you define " The coefficient of restitution"?
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