How to bounce an Object after collision2D

Hello,

I tried to get the physics of Zelda 3.

I have two GameObject : - Player - Ennemy

When my Player enter in collision with the Ennemy i you to bounce the player in the opposite of direction.

How can i do this ?

I try :

 rb.AddForce(new Vector2(1,1) * 50, ForceMode2D.Impulse); 

But it does not work

I change Impule by Force and my char move by teleportation. I just want a "smooth" moving.