Directional booster

Well, I have a platform with an arrow, and a player, I want that when the player triggers the platform, him receive a force in the arrow direction, only in Z rotation.
So, if arrow have a (0,0,0) rotation, the player needs to boost in (0,0,1) direction, if arrow is (0,0,180) the direction needs to be (0,0,-1).
sorry if my english is bad
thanks in advance

The easy way of accomplishing this is to identify in which directional vector the forefront of the arrow lays. So if the arrows forward pointing direction is Object.transform.forward then all you have to do is:

Player.GetComponent<Rigidbody>().AddForce(Arrow.transform.forward * Force);

Which should add a force in the specified forward direction in relation to the arrow.