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Homework Help: Three ball collision

  1. Jul 11, 2015 #1
    1. The problem statement, all variables and given/known data
    Ball of mass M collide two balls of mass m , elastic collision .
    initially, M has velocity v , and two balls are stationary.
    after the collision the two masses move ,like in figure , v_a , v_b /
    What is the velocity V ,of mass M after the collision ?

    2. Relevant equations

    3. The attempt at a solution
    try to manipulate the equations , with no success.

    Attached Files:

  2. jcsd
  3. Jul 11, 2015 #2
    Your notation is a bit confusing, but I think I get it.

    Consider that you have four scalar unknowns (vx, vy, v1, and v2) but only three equations.
  4. Jul 11, 2015 #3
    fix notation upload_2015-7-11_20-27-5.png
  5. Jul 11, 2015 #4


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    The way I read it, vA, vB are given, so it's 3 equations and 2 unknowns. Still not good. Could choose to ignore the elasticity condition.

    momo, are you sure you have quoted the question exactly?
    I assume your last equation in post #3 should read v'2=v'x2+v'y2.
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