you could make me a new script or modify the shoot script here if you want. Here is my script:
var projectile : Rigidbody;
var speed = 20;
var cloneSpeed = 10;
function Update () {
if ( Input.GetButtonDown ("Fire1")) {
clone = Instantiate(projectile, transform.position, transform.rotation);
clone.velocity = transform.TransformDirection( Vector3 (1, 1, speed));
Destroy (clone.gameObject, 5);
}}