StupidAutopilot2.cs

using System;
using UnityEngine;

namespace Assets
{
    public class AutopilotController : MonoBehaviour
    {
        [SerializeField] private Transform _target;
        [SerializeField] private Vector3 _initialVelocity;
        [SerializeField] private Single _acceleration;

        private void Start()
        {
            GetComponent<Rigidbody>().velocity = _initialVelocity;
        }

        private void Update()
        {
            var thisRigidbody = GetComponent<Rigidbody>();

            Vector2 tdir = _target.position - transform.position;
            Vector2 velocity = thisRigidbody.velocity;

            thisRigidbody.AddForce(CalculateForce(tdir, velocity));
        }

        private Vector2 CalculateForce(Vector2 tdir, Vector2 velocity)
        {
            return (Mathf.Sqrt(_acceleration * tdir.magnitude) * tdir.normalized - velocity)
                       .normalized * _acceleration;
        }
    }
}