Recent content by Eminem04

I got my answer by using M*Vi=M*Vf

I need help with this problem. I tried it myself but I'm not sure if it's correct ( i got 4 m/s ) A billiard ball traveling at 4.0 m/s has an elastic head-on collision with a billiard ball of equal mass that is initially at rest. The first ball is at rest after the collision. What is the speed...