RigidBody2D - AddForce - KnockBack Effect.

Hello everyone.

Im trying to create a knockback effect.

So, I have 2 gameObjects.

1)Player 2)Ball

What I want to accomplish is to randomly create a ball that moves towards the player, when hit, the player must move "back" from where it was hit.(As like following the path of the ball).

What I was trying was :

 void OnCollisionEnter2D(Collision2D other) {
         Debug.LogWarning ("Player Collision");
         
             
             if (other.gameObject.tag.Equals("Ball"))
             {
                 _playerRigidB.AddForce(other.rigidbody.velocity * 1);
                 Debug.Log ("Pushing");
             }
         
             Debug.Log ("done");
     } 

But it doesn't seem to be working. Am I doing this correctly?

Thanks for your time.