Knockback player to selected position

I'm trying to make a plugin which knockback the player from anywhere to a specific position (for example 1, 1, 17)
I don't want to teleport the player.
How i do that?

 

Apply the force to the player's vector position by using the add function

 

Can you give me example? Sorry, idk what do you mean :/

 

PHP:

$player->add($x, $y, $z);