Legacy Documentation: Version 5.3
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Collision.relativeVelocity

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public var relativeVelocity: Vector3;
public Vector3 relativeVelocity;

Description

The relative linear velocity of the two colliding objects (Read Only).

#pragma strict
// Play a sound when we hit an object with a big velocity
var audio: AudioSource;
function Start() {
	audio = GetComponent.<AudioSource>();
}
function OnCollisionEnter(collision: Collision) {
	if (collision.relativeVelocity.magnitude > 2)
		audio.Play();
}
// Play a sound when we hit an object with a big velocity
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { AudioSource audio; void Start() { audio = GetComponent<AudioSource>(); } void OnCollisionEnter(Collision collision) { if (collision.relativeVelocity.magnitude > 2) audio.Play(); } }