PushModule.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// To be added to an AI to control being pushed by outside sources.
/// </summary>
public class PushModule : MonoBehaviour {

	[Tooltip("Rate at which we return to velocity zero.")]
	public float damping = 2f;

	[Tooltip("True to automatically apply the push velocity.  False to allow some other system to handle that.")]
	public bool autoApply = true;

	Vector3 _velocity = Vector3.zero;
	public Vector3 velocity {
		get {
			return _velocity;
		}
	}

	// Update is called once per frame
	void Update () {
		_velocity = Vector3.Lerp(velocity, Vector3.zero, damping * Time.deltaTime);
		if (_velocity.sqrMagnitude < 0.1f) {
			_velocity = Vector3.zero;
		}

		if (autoApply) {
			transform.position += velocity * Time.deltaTime;
		}
	}

	public void AddVelocity(Vector3 additionalVel)
	{
		_velocity += additionalVel;
	}
}