How to move Enemy Gameobject with Rigidbody force/velocity to follow Player?

I use the script below to make Enemy GameObject follow Player:

     public Transform target;
     public float speed;
     Rigidbody rb;

     // Start is called before the first frame update
     void Start()
     {
         rb = GetComponent<Rigidbody>();
     }
 
     // Update is called once per frame
     void FixedUpdate()
     {
         Vector3 pos = Vector3.MoveTowards(transform.position, target.position, speed * 
         Time.deltaTime);

         rb.MovePosition(pos);

         transform.LookAt(target);
     }

But I want them to move using Rigidbody velocity/force. There are Rigidbody objects placed in Scene. On contact Enemy goes through them but instead I want them to push those objects forward or away while following Player.