[Unity 2017] Basket Ball AR

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  using UnityEngine.UI;
  using UnityEngine.SceneManagement;

  public class BasketControl : MonoBehaviour {
    public Text my_score;
    GameObject A;
    Transform B;

    static public int gamescore = 0;
    
    public GameObject basketBall;
    public Transform firepoint;
    Rigidbody ballrigid;

    public void ShootBall(){
        ballrigid.useGravity = true;
        ballrigid.AddForce(Vector3.up * 600f);
        ballrigid.AddForce(Vector3.forward *500f);
    }

  	void Start () {
      ballrigid = basketBall.GetComponent<Rigidbody>();
    }
	
  	void Update () {
      my_score.text = gamescore.ToString();
      if (basketBall.transform.position.y <= -15f){
        initball();
      }
    }

    void initball(){
      basketBall.transform.position = firepoint.transform.position;
      basketBall.transform.eulerAngles = Vector3.zero;
      ballrigid.velocity = Vector3.zero;
      ballrigid.angularVelocity = Vector3.zero;
      ballrigid.useGravity = false;
    }
  }

      using System.Collections;
      using System.Collections.Generic;
      using UnityEngine;

      public class BallControl : MonoBehaviour {

	      void Start () {
          this.gameObject.GetComponent<Rigidbody>().useGravity = false;
	      }

        void OnTriggerEnter(Collider other){
          if (other.gameObject.name == "score_box"){
            BasketControl.gamescore += 1;
            print(BasketControl.gamescore);
          }
        }

          void Update () { }
      }