Coefficient of restitution (1D) (e = (v₂f − v₁f)/(u₁ − u₂))
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e = (v₂f − v₁f)/(u₁ − u₂)
What each symbol means
| Symbol | What it stands for |
|---|---|
| e | Coefficient of restitution (0 ≤ e ≤ 1 for passive collisions) |
| u_1, u_2 | Initial velocities along line of centres (m/s) |
| v_{1f}, v_{2f} | Final velocities along same line (m/s) |
When to use this
Central collision along a line; velocities along line of impact; sign convention must be consistent (same positive direction).