Explore the mathematics and implementation of idealized elastic collisions in a JavaScript physics simulation using p5.js. Dive into the intricacies of collision detection and resolution without relying on third-party physics libraries. Learn how to calculate momentum, kinetic energy, and the line of impact between colliding circles. Follow along as the code is developed step-by-step, from basic collision detection to optimizing for multiple particles. Gain insights into the underlying physics principles and their practical application in programming. Perfect for those interested in game development, physics simulations, or enhancing their JavaScript and p5.js skills.