BulletMovement

BulletMovement.cs

using UnityEngine;
using System.Collections;

public class BulletMovement : MonoBehaviour {

	public float speed;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {

		float magnitude = speed * Time.deltaTime;

		this.transform.position = new Vector2(this.transform.position.x,
		                                      this.transform.position.y + magnitude);

		//Camera.main.ScreenToWorldPoint(
		//new Vector3(Camera.main.pixelWidth,0)).x

		float topOfTheScreen = Camera.main.ScreenToWorldPoint(
			new Vector3(0,Camera.main.pixelHeight)).y;

		if(this.transform.position.y > topOfTheScreen){
			Destroy(this.gameObject);
		}


	}
}