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## Homework Statement

A billiard ball moving at 2 m/s collides (0 degrees) with another of the same weight and at rest, in a perfectly elastic collision. Demonstrate with equations why the balls trade velocities.

## Homework Equations

## The Attempt at a Solution

In the provided explanation, I can understand what the parallel equations they set up represent, and how they reduce them by cancelling, but I cant see how the final logical step is made, where they deduce that V1 = 0,