(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Two Billiard balls of equal mass undergo a perfectly elastic head on collision

(Energy is conserved) . If the speed of one ball was initially at 2.0 m/s

and the other 3.0 m/s in the opposite direction, what will be their speeds after the

collision??

2. Relevant equations

m1v1 + m2v2 = m1v1' + m2v2'

1/2 m1v1^2 + 1/2 m2mv2^2 = 1/2m1v1 '^2 + 1/2m2v2 '^2

3. The attempt at a solution

so far i have simplified both formulas so that it's

v1' = v1 + v2 - v2'

v2' = v1^2 + v2^2 - v1 '^2

That's as far as a can go but i'm stuck what should my next step be......

The answer is v1 = 3 m/s & vs = 2 m/s if it helps anyone

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Billiard balls collision

**Physics Forums | Science Articles, Homework Help, Discussion**