How to make AddForce dash smoother, instead of teleporting

Right now I have a code for player dashing when I press the button “M”.

    public Rigidbody2D rb;
       public float runSpeed = 5f;
        void Start()
                rb = GetComponent<Rigidbody2D>();
        void Update(){
             rb.AddForce(transform.right * (runSpeed * 1000f), ForceMode2D.Force);

The problem is when player dashes, it almost looks like teleporting - he instantly appears in the dash direction, instead of fastly moving. I tried using ForceMode2D.Impulse, but then player doesn’t dash at all. Would be great, if you could help me. Thanks

Use lerp, for more info see tutorials.