i'm new to unity. I want to make a script that creates and throws a ball. You can't throw the ball again until you pick it up. My throwing part works but the pick up action doesn't

Questions & Answers
1

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

public class PickUpObject : MonoBehaviour
{
    GameObject prefab;
    public GameObject prefab2;
    public bool ballThrown = false; 

    void Start()
    {
        prefab = Resources.Load("projectile") as GameObject;
        
    }

     void Update()
    {
        if(Input.GetMouseButtonDown(0))
        {
            if (ballThrown == false)
            {
                GameObject projectile = Instantiate(prefab) as GameObject;
                projectile.transform.position = transform.position + Camera.main.transform.forward * 2;
                Rigidbody rb = projectile.GetComponent<Rigidbody>();
                rb.velocity = Camera.main.transform.forward * 40;
                ballThrown = true;
            }

            if(ballThrown == true)
            {

            }
        }


    }

    void OnCollisionStay(Collision node)
    {
        if (node.gameObject.tag == "ball")
        {
            ballThrown = false;
            Destroy(node.gameObject);
        }
    }

}
2

Rather than use a prefab and instantiate you should just make a public GameObject variable and assign it your ball in the inspector, then instead of destroying it you pick it back up.