stoping objects oncollision exit

how can i an exit script to this script so instead of stoping objects completely on exit it will like slowly come to a stop rather than instantly? public bool useFixedDirection; public Vector3 pullDirection; public float timescale = 1; public float pullSpeed; public float radius;

  private SphereCollider _col;
  private Vector3 _enterDirection;
 
  private void Start()
  {
      _col = GetComponent<SphereCollider>();
  }
 
  private void Update()
  {
      _col.radius = radius;
      Time.timeScale = timescale;
  }
 
  private void OnTriggerEnter(Collider other)
  {
      _enterDirection = (transform.position - other.transform.position).normalized;
  }
 
  private void OnTriggerStay(Collider other)
  {
      float _dist = Vector3.Distance(other.transform.position, transform.position);
      float _ratio = _dist / radius;
      if (useFixedDirection)
          other.attachedRigidbody.AddForce(pullDirection * pullSpeed * _ratio);
      else
          other.attachedRigidbody.AddForce(_enterDirection * pullSpeed * _ratio);
  }
 
  private void OnTriggerExit(Collider other)
  {
      other.attachedRigidbody.velocity = Vector3.zero;
  }

}

@Kilsnus