Rigidbody2D falls slowly with MovePosition?

I'm trying to make a simple 2D character controller, but with the following code the player falls extremely slowly! I've seen similar problems before, but I can't seem to find a working answer. I know I could directly set rb.velocity, but I'm curious as to why t$$anonymous$$s is not working. Any thoughts? Thanks! using UnityEngine;

 public class PlayerMotor : MonoBehaviour {
 
     private Rigidbody2D rb;
     private Vector2 vel;
     private bool jumped;
 
     private void Awake()
     {
         rb = GetComponent<Rigidbody2D>();
     }
 
     public void Move(float h)
     {
         vel = new Vector2(h, rb.velocity.y);
         //transform.Translate(vel * Time.deltaTime);
     }
 
     public void Jump()
     {
         jumped = true;
     }
 
     private void FixedUpdate()
     {
         rb.MovePosition(rb.position + vel * Time.fixedDeltaTime);
     }
 }