1D Collision Calculator (Elastic & Inelastic)

Final velocities after a one-dimensional elastic or perfectly inelastic collision, with momentum and kinetic energy check.

How to use the 1D Collision Calculator

Enter or select: Mass m₁, Velocity u₁, Mass m₂, Velocity u₂, Collision type.
The results (Final v₁, Final v₂, Total momentum, Kinetic energy lost) are calculated instantly as you type.
Use “Copy link” to share the calculation with the same input values.

Formula

Elastic: v₁ = ((m₁ − m₂)u₁ + 2m₂u₂)/(m₁ + m₂)
Inelastic: v = (m₁u₁ + m₂u₂)/(m₁ + m₂)