Homework Help: 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?
I assume your last equation in post #3 should read v'2=v'x2+v'y2.

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