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## Homework Statement

A ball of mass 0.8kg moving initially at 8.0m/s has a head on collision with a 0.4kg ball that is at rest. If the collision is perfectly elastic, what is the velocity of each ball after the collision?

## Homework Equations

E

_{k}=(mv

^{2})/2

## The Attempt at a Solution

I found the kinetic energy of the first ball, then split the knietic energy between the two balls after the collision to individually find the velocity of each.