Character falls at a very slow rate in Unity. How to fix?

Question

Unity

I have a problem here related to character programming in Unity. In short, I created a regular sprite with a wall texture, added Rigid Body 2D to it (everything is set to the standard), Box Collider 2D (everything is set to the standard too). The sprite falls at normal speed. But for some reason, when I add a script to it, it starts to fall at an incredibly low speed, although there seems to be nothing like that in the script. I don't know how to fix it. Need help.
Here is the script itself:

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

public class monster_boy_settings : MonoBehaviour
{
  public float movespeed;
  public float addForce;
  public Rigidbody2D rb;
    void Update()
    {
        rb.velocity = new Vector2(Input.GetAxis("Horizontal") * movespeed, 0);
        if (Input.GetKeyDown(KeyCode.W))
        {
            rb.AddForce(Vector2.up * addForce,ForceMode2D.Impulse);
        }
    }
}

Answer 1

In update, the speed in y is constantly equal to 0, so it does not fall.