using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    using UnityEngine.Tilemaps;
    
    public class Box : MonoBehaviour
    {
        const float Gravity = -0.01f;
    
        Vector3 pos;
        Vector3 speed    = new Vector3();
    
        // Start is called before the first frame update
        void Start()
        {
            //Transform.Positionを複製
            pos = this.transform.position;
            //初期速度は0
            speed = Vector3.zero;
        }
    
        // Update is called once per frame
        void Update()
        {
            //現在位置を受け取る
            pos = this.transform.position;
 
            //ボックスの自由落下
            speed.y = speed.y + Gravity;
            pos = new Vector3( pos.x, pos.y + speed.y, 0);

            //新しい位置をTransform.Positionに代入する
            transform.position = pos;
        }
    }