Calculate velocity x and y directions based on speed and angle

Well, it might be a simple math solution but i can't seem to find it. It's pretty straight forward.

I have a player object that 'jumps' by adding y-velocity like this :

 _rigidBody2D.velocity = new Vector2(_rigidBody2D.velocity.x,jumpHeight);

I want to use this same method to let the player bounce from another object. That object can be rotated. So i get something like this:

 player.Bounce( bounceForce, transform.rotation.eulerAngles.z );

 public function Bounce( bounceForce : float, bounceAngle : float ) 
 {
     bounceForceX = calculate the force by the ueler angle and force;
     bounceForceY = calculate the force by the ueler angle and force;
     _rigidBody2D.velocity = new Vector2(bounceForceX,bounceForceY);
 }

Thanks in advance!