The maximum default velocity needed to move a Rigidbody's collider out of another collider's surface penetration. Must be positive.
This value is usually changed in Edit->Project Settings->Physics inspector instead of from scripts.
Note: Very large values can introduce instability during collision detection; too small values might cause the collider depenetration to fail.
You can also set a maximum depenetration velocity for individual Rigidbodies via Rigidbody.maxDepenetrationVelocity.
using UnityEngine;
public class Example : MonoBehaviour { void Start() { Physics.defaultMaxDepenetrationVelocity = 5.0f; } }