A ball X of mals 1 kg travelling at 2 m/s has a head-on collision with an identical ball Y at rest.
X stops and Y moves off. What is Y's velocity?

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.