How can I find the velocity on a rigidbody which moves using Lerp?

Hello,

I need some help with finding the velocity on an object which moves using a Vector.Lerp. It seems that if you move an object the way stated, a velocity on the rigidbody is not applied.

This seems strange to me as the lerp uses a time in which it moves the object between two points.

Is there something simple that i have missed, or is there a way to find the velocity of an object which moves using lerp?

Here is some sample code, never mind some of the bad scripting since it's only a test!

Thanks in advance!

 using UnityEngine;
 using System.Collections;
 
 public class MyPlayerController : MonoBehaviour
 {
     public Transform myTransform;
     public Vector2 currentLocation;
     public Vector2 newLocation;
 
     public float newLocationY;
     public float smooth;
 
     public float nextMove = 0.1f;
     public float moveRate = 0.1f;
 
     public float tilt;
 
     void Start()
     {
         myTransform = transform;
     }
 
     void Update()
     {
         currentLocation = transform.position;
 
         if(Input.GetKeyDown(KeyCode.LeftArrow) && Time.time > nextMove && myTransform.position.y < 8f)
         {
             nextMove = Time.time + moveRate;
             newLocationY = currentLocation.y + 3f;
             newLocation = new Vector2(0, newLocationY);
         }
         else if(Input.GetKeyDown(KeyCode.RightArrow) && Time.time > nextMove && myTransform.position.y > -8f)
         {
             nextMove = Time.time + moveRate;
             newLocationY = currentLocation.y -3f;
             newLocation = new Vector2(0, newLocationY);
         }
         //Move
         myTransform.position = Vector2.Lerp(currentLocation, newLocation, smooth * Time.deltaTime);
         //Rotate
 
                                                         //!
                                                         //!This is always nort!
         myTransform.rotation = Quaternion.Euler(0, 0, rigidbody2D.velocity.y * -tilt);
 
         //This ALWAYS displays (0.0, 0.0)
         Debug.Log(rigidbody2D.velocity);
     }
 }