Math random in action script3 - actionscript-3

Question

I am making a game and I am trying to create an array of the same object falling in multiple spots. I would also like to have them fall at different spots, using the math random. The problem that I am encountering is that the objects (bananas) don't show up on the screen at all. Can math random be used on the y-axis in action script 3? If so, could someone give me an example?
This is what I have in the main program:
var numBananas = 20;
var theBananas: Array = new Array();
theBananas = [];
for (var i = 0; i < numBananas; i++) {
var aBanana: banana_fall = new banana_fall();
aBanana.y=-10;
theBananas.push(aBanana);
theBananas[i].setSpeed(-(Math.random()), 5);
And this is what I have in the action script class:
package {
import flash.display.MovieClip;
import flash.utils.Timer;
import flash.events.TimerEvent;
import flash.events.MouseEvent;
import flash.events.Event;
import flash.events.Event;
public class banana_fall extends MovieClip {
var velX: Number = 0;
var velY: Number = 0;
var falling: Boolean = false;
var gravity: Number = 2;
public function banana_fall() {
var timing: Timer = new Timer(20, 0);
timing.addEventListener(TimerEvent.TIMER, moveMe);
timing.start();
}
private function moveMe(event: TimerEvent) {
this.x = this.x + velX;
this.y = this.y + velY;
if (falling) {
falling=true;
velY = velY + gravity;
}
}
public function setSpeed(dx, dy) {
velX = dx;
velY = dy;
}
}
}

Answer 1

I think the problem is within this method:
private function moveMe(event: TimerEvent)
{
this.x = this.x + velX;
this.y = this.y + velY;
if (falling)
{
falling=true;
velY = velY + gravity;
}
}
You set negative velocity and falling is false initially so gravity never works. Your bananas go bananas, they appear above the screen and flee up into the open space of negative y.
As a general rule, you need to trace(...) things to understand what's the problem. Also, there's no need to explicitly use this in class methods:
private function moveMe(event: TimerEvent)
{
x += velX;
y += velY;
if (falling) velY += gravity;
trace("[BANANA] position:", x, y, "speed:", velX, velY);
}