revival/game/Assets/FallawayFloor.cs

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

public class FallawayFloor : MonoBehaviour
{
    public float speed;
    Rigidbody rb;

    private void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    private void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.tag == "Player")
        {
            StartCoroutine(DestroyFloor());
        }
    }

    IEnumerator DestroyFloor()
    {
        rb.velocity = Vector3.down * speed;
        yield return new WaitForSeconds(1);

        Destroy(gameObject);
        yield return null;
    }
}