need help with jump script

Unity Engine
1

Hello I need help with my jump script.
The problem is that my player keeps falling trough the ground

var JumpStrength : float = 5;
var JumpDecay : float =0.01;
var Jumped : boolean = false;

function Start () {
    this.gameObject.AddComponent(Rigidbody);
    this.rigidbody.freezeRotation = true;
}

function Update () {
    if (this.Jumped)
    {
        this.transform.position.y += this.JumpStrength - this.JumpDecay;
        this.JumpDecay += 0.009;
    }
}

function LateUpdate()
{
        if ( !this.Jumped)
        this.Jumped = true;
}


function OnCollisionEnter(theCollision : Collision){
         if(theCollision.gameObject.tag == "Ground")
         {
         this.Jumped=false;
         this.JumpDecay=0;
         }
}

Can someone help?

2

Could the part in LateUpdate() be the problem? (I can’t test it at the moment, but it looks like this.Jumped is not false for a long time).