Ball bounces too much from AI collision

Questions & Answers
1

I want to create a simple pong game with an AI as an enemy. Everything is good until I add the AI movement script to the racket. The problem is as soon as the ball hits the racket it behavs like it has a bounciness 1000 or it got 1000 force. So the ball speed gets suddenly too much.

Here is the code:
using UnityEngine;
using System.Collections;

public class AIMovement : MonoBehaviour {
	public GameObject ball;
	public float speed;

	private Rigidbody2D rb2D;

	// Use this for initialization
	void Start () {
		rb2D = GetComponent<Rigidbody2D> ();
	}
	
	// Update is called once per frame
	void FixedUpdate () {
		Vector2 move = new Vector2 (ball.transform.position.x, 0.0f);

		rb2D.MovePosition (move);
	}
}

If I add code from manual the bounce behaves like it should but the movement of the racket behaves like it has 3000 ping.

rb2D.MovePosition(rb2D.position + velocity * Time.fixedDeltaTime);
2

the force is adding contentiously… it has to add only one time whenever you call

3

So I found a workaround for this. Here is the code. Speed is for making the AI beatable.

using UnityEngine;
using System.Collections;

public class AIMovement : MonoBehaviour {
	public Transform ball;
	private float speed;
	public float distance;

	private Rigidbody2D rb2D;

	void Start(){
		rb2D = GetComponent<Rigidbody2D> ();
	}

	void FixedUpdate(){
		speed = Time.fixedDeltaTime * 40;

		if ((transform.position.y - ball.position.y) >= distance) {
			rb2D.MovePosition(new Vector2(ball.position.x, 0.0f) * speed);
		}
	}
}

Basically I had to put the MovePosition to an if statement and the minimum distance must be set to 0.6. Below that the weird thing is happening;

I still don’t know why it happens tho.