Help with Destory a vechicle code.

Hi . Developers , i am new to unity working on racing game with weapon . i have an issue on which i get stuck . I spawn a bunch of vehicles through loop , i want to destroy single vehicle if health is <=0

i spawn vehicles using this code

 public void SpawnVehicles(int vehicle){
         GameObject playercar;
         GameObject opponentrcar;
         gameTime = readyTime;
         readyTimer = true;
         countDown = true;
         spawnPoints[0].SetActive (false);

         playercar = Instantiate(playableVehicles.vehicles[raceData.vehicleNumber], spawnPoints[0].transform.position, spawnPoints[0].transform.rotation) as GameObject;

         playercar.transform.rotation = spawnPoints[0].transform.rotation;
         playercar.GetComponent<UnityStandardAssets.Vehicles.Car.CarUserControl>().enabled = false;
         racerInfo [0].racer = playercar;
         racerInfo[0].racer.name = racerInfo[0].racerName;
         racerInfo [0].lap = 1;
         playerController = playercar.GetComponent<UnityStandardAssets.Vehicles.Car.CarUserControl>();
         racerInfo[0].aIHelper = racerInfo[0].racer.GetComponent<RG_AIHelper>();
         racerInfo[0].aIController = racerInfo[0].racer.GetComponent<UnityStandardAssets.Vehicles.Car.CarAIControl>();
         racerInfo [0].waypointController = racerInfo [0].racer.GetComponent<UnityStandardAssets.Utility.WaypointProgressTracker> ();
         racerInfo [0].currentWaypoint = Waypoints [0];
         Debug.Log (raceData.numberOfRacers[raceData.raceNumber]);

             for(int i = 1; i < raceData.numberOfRacers[raceData.raceNumber]; i ++){
             spawnPoints[i].SetActive (false);
             opponentrcar = Instantiate(opponentVehicles.vehicles[i - 1], spawnPoints[i].transform.position, spawnPoints[i].transform.rotation) as GameObject;
             opponentrcar.transform.rotation = spawnPoints[i].transform.rotation;
             racerInfo[i].racer = opponentrcar;
             racerInfo[i].racerName = opponentVehicles.opponentNames[i - 1];
             racerInfo[i].racer.name = racerInfo[i].racerName;
             racerInfo [0].lap = 1;
             if(racerInfo[i].racer.GetComponent<UnityStandardAssets.Utility.WaypointProgressTracker>()){
                 racerInfo[i].aIHelper = racerInfo[i].racer.GetComponent<RG_AIHelper>();
                 racerInfo[i].aIHelper.opponentNumber = i;
                 racerInfo[i].aIController = racerInfo[i].racer.GetComponent<UnityStandardAssets.Vehicles.Car.CarAIControl>();
                 racerInfo [i].waypointController = racerInfo [i].racer.GetComponent<UnityStandardAssets.Utility.WaypointProgressTracker> ();
                 racerInfo [i].positionScore = 0;
                 racerInfo [i].currentWaypoint = Waypoints [0];
             }
         }
         opponentrcar = null;
         for (int i = 0; i < spawnPoints.Length; i++) {
             spawnPoints [i].SetActive (false);
         }
     }

i want to destroy vehicle using java code

   var hitACounter1 : int = 100;
   var Target1:GameObject;
   var destroyedcar:GameObject; 
 
   function Update () {
       if(hitACounter1<=0){
               Destroy(Target1.gameObject);
               Instantiate(destroyedcar,Target1.transform.position,Target1.transform.rotation);
           }
       }
 
   function OnTriggerEnter (hit : Collider) {
     if(hit.gameObject.tag =="Bullet" || "Bomb"){
         hitACounter1--;
     }
 }

This is my graduation project kindly guide me solution or any other good way to do that . Only thing left in my project is damage system .