Coefficient Of Restitution — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Coefficient of Restitution Applies to 1D collisions or the component of velocity along the line of impact in 2D/3D collisions. Define Relative Velocity of Approach as u 1 - u 2. Define Relative Velocity of Separation as v 2 - v 1. Define e as the ratio of Separation Speed to Approach Speed. Formulate Newton's Law of Restitution. 0 <= e <= 1 u 1 != u 2 (objects must approach to collide) Believing e depends on the masses of the objects (it is a property of the materials and geometry). Failing to account for vector signs (direction) when calculating velocity differences. Thinking e > 1 is possible in passive collisions (implies energy creation).