Collision.rigidbody

Description

The Rigidbody we hit (Read Only). This is null if the object we hit is a collider with no rigidbody attached.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    // Make all rigidbodies we touch fly upwards
    void OnCollisionStay(Collision collision)
    {
        // Check if the collider we hit has a rigidbody
        // Then apply the force
        if (collision.rigidbody)
        {
            collision.rigidbody.AddForce(Vector3.up * 15);
        }
    }
}