praca_magisterska/games/unity/magisterka_1/Assets/Bullet.cs

using UnityEngine;

public class Bullet : MonoBehaviour
{
    public float speed = 10f;

    void Update()
    {
        transform.Translate(Vector3.up * speed * Time.deltaTime);
        if (transform.position.y > 10) Destroy(gameObject); // Out of bounds
    }
}