# Three ball collision

1. Jul 11, 2015

### momo1111

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.
help

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2. Jul 11, 2015

### Dr. Courtney

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.

3. Jul 11, 2015

### momo1111

fix notation

4. Jul 11, 2015

### haruspex

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?