How can I slow the velocity of my player without it affecting fall speed?

I have been trying to slow my player to a stop when a key is not pressed. I have accomplished this by multiplying the rigidbody(2D)'s velocity by a decimal. However, the problem is that the tank falls very slowly. Is there anyway I can get it to not affect this? Should I implement a gravity multiplyer? Or is there a simpler way? Thanks in advanced.

here is my code:

     public float force;
     public float resistence;
     public Rigidbody2D tank;
 
     private void Start()
     {
         tank = GetComponent<Rigidbody2D>();
     }
 
     private void FixedUpdate()
     {
         if (Input.GetKey("w"))
         {
             force = 10;
             tank.AddForce(transform.right * force);
         }    
        else if (Input.GetKey("s"))
         {
             force = 10;
             tank.AddForce(-transform.right * force);
         }      
        else if (!Input.GetKey("s") || !Input.GetKey("s"))
         {
             tank.velocity = tank.velocity * resistence;
         }
     }
 
 }