Editing a variable in another script during runtime

Hi community!
I have a “mover” attached to my “obstacle”-Prefab which moves these spawned objects with “AddForce”.
Now i want to increase the speed of these obstacles for each spawned obstacle during runtime.
How can i access the public variable “speed” of the “mover”-Script with my “Game Controller”-Script?

Thanks to you guys! I found the solution!
Here is what helped me:

var target : GameObject;

function InitProjectile()
{
var newProjectile : Projectile = Instantiate(porjectilePrefab,position,rotation);
var otherScript : newProjectile.GetComponenet.();
target = otherScript.victim;
}