Hi,so i'm new to unity and I need help on delaying an object

So i’m trying to remake pong for practice and I want to delay the ball from moving when the game starts. I want to delay it by 3 seconds and this is what I have now (written in unity JavaScript)

var rb : Rigidbody2D;
var speed : float = 10;

function Start() {
rb.AddForce(new Vector3(Random.Range(-80,80)/10,Random.Range(-80,80)/10,0)*speed);
}

For all of those who want to know, I figured it out by asking a friend and it will work like this

var rb : Rigidbody2D;
var speed : float = 10;

function Start(){
yield WaitForSeconds(3);
rb.AddForce(new Vector3(Random.Range(-80,80)/10,Random.Range(-80,80)/10,0)*speed);
}