This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams.

In this episode you will learn:

- How to apply the principle of conservation of momentum (m1v1 + m2v2 = m1v1' + m2v2') to solve collision problems.

- The correct formula for the coefficient of restitution, e = (v2' − v1') / (v1 − v2), and its application.

- The key differences between elastic (e=1), inelastic (e<1), and perfectly plastic (e=0) collisions.

- Common FE exam traps including sign conventions for velocity vectors and the specific subscript order in the restitution formula.

- A mnemonic ('2 minus 1 over 1 minus 2') to correctly remember the structure of the coefficient of restitution equation.

For more free exam prep tools, practice questions, and AI-powered explanations, visit https://open-exam-prep.com/ or YouTube Channel: https://www.youtube.com/@Open-exam-prep