How to create knockback to a paper 2D enemy

Hi there,
I am creating a 2D game for my class and am trying to figure out how to add knockback to the enemy character. I have it right now so when the actor hits the zombie he loses health and then dies but i want to make it so if the hit doesn’t kill the enemy it launches him back. I can’t use impulse because it’s a flipbook so is there any other way or is there a better way to make my enemy?

please and thank you in advance!!!