Can't get object to destroy itself on collision.

I am trying to get a bullet object destroy itself on collision, in a 2D game. I read a page about collision by Unity and copied the code in, but I didn't get any results. My bullet object has a Rigidbody 2D with Continuous collision detention. I made sure everything was on the same Z coordinates and layer. Here is the coed for my bullet object.

using UnityEngine; using System.Collections;

public class Move_Trail : MonoBehaviour {

 public float moveSpeed = 5;
 
 void start()
 {
 }
 // Update is called once per frame
 void Update () {
     transform.Translate(Vector3.right * (Time.deltaTime ) * moveSpeed);
     Destroy(gameObject, 1);
 }

 void OnCollisionEnter2D(Collision2D coll)
 {
     Destroy(this.gameObject);
 }

 void OnCollisionEnter(Collision collisionInfo)
 {
     Destroy(this.gameObject);
     print("Detected collision between " + gameObject.name + " and " + collisionInfo.collider.name);
     print("There are " + collisionInfo.contacts.Length + " point(s) of contacts");
     print("Their relative velocity is " + collisionInfo.relativeVelocity);
 }

 void OnCollisionStay(Collision collisionInfo)
 {
     Destroy(this.gameObject);
     print(gameObject.name + " and " + collisionInfo.collider.name + " are still colliding");
 }

 void OnCollisionExit(Collision collisionInfo)
 {
     Destroy(this.gameObject);
     print(gameObject.name + " and " + collisionInfo.collider.name + " are no longer colliding");
 }


 void OnTriggerEnter(Collider other)
 {
     Destroy(this.gameObject);
     print("Collision detected with trigger object " + other.name);
 }

 void OnTriggerStay(Collider other)
 {
     Destroy(this.gameObject);
     print("Still colliding with trigger object " + other.name);
 }

 void OnTriggerExit(Collider other)
 {
     Destroy(this.gameObject);
     print(gameObject.name + " and trigger object " + other.name + " are no longer colliding");
 }

}

At this point, I am all out of ideas.