lvjincheng_infraredlocategamepc/Assets/GameDemo/BombChild.cs

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

public class BombChild : MonoBehaviour
{
    public Vector3 velocity;

    void Update()
    {
        velocity.y += -9.8f * Time.deltaTime * 80;
        transform.localPosition += velocity * Time.deltaTime; 
        if (transform.position.y < -(Screen.height / 10)) Destroy(gameObject);
    }
}