can anyone explain to me how to set a gameobject movement to zero after second and then start it back again to moving regularly after seconds?

You could use a timer method like this:

 float timer = 0;
 float waitTime = 1; //seconds
 bool waiting = false;
 Vector3 previousVelocity;
 Vetcor3 previousAngularVelocity;
 Rigidbody rigidbody; //your gameObject's rigidbody
 Update(){
   if(timer >= waitTime && waiting){
     //this starts the object again with its old velocity once the time you specify has passed
     waiting = false;
     rigidbody.velocity = previousVelocity;
     rigidbody.angularVelocity = previousAngularVelocity;
   }
   if(waiting){
      timer += Time.deltaTime;
      //this stores the velocity info and then stops the object
      previousVelocity = rigidbody.velocity;
     previousAngularVelocity = rigidbody.angularVelocity;
      rigidbody.velocity = Vector3.zero;
      rigidbody.angularVelocity = Vector3.zero;
      
   }
 }

then when you want to stop the gameObject for that amount of time just call waiting = true; : )

Hello!

I would really use the coroutine, instead of doing a unnecessarily complex update function, which will in addition slow your game.

There are two things that can be done here. First, you could only remove the velocity / angular velocity of your object, but this will only stop it before it starts moving again. That is the following code:

 [SerializeField]
 private Rigidbody rigidBody; // The rigidbody to stop
 [SerializeField]
 private float delay = 1f; // The delay to wait
 private Vector3 prevVelocity;
 private Vector3 prevAngularVelocity;
 
 // Use this for initialization
 void Start()
 {
     StartCoroutine(StopCoroutine());
 }
 
 IEnumerator InterruptCoroutine()
 {
     yield return new WaitForSeconds(delay); // Wait for the specified delay
 
     prevVelocity = rigidBody.velocity; // Get the current velocity to put it again after
     prevAngularVelocity = rigidBody.angularVelocity; // Get the current angular velocity to put it again after
 
     // Stop the motion of the rigidbody
     rigidBody.velocity = Vector3.zero; 
     rigidBody.angularVelocity = Vector3.zero;
 
     yield return new WaitForSeconds(delay); // Wait again for the specified delay
 
     rigidBody.velocity = prevVelocity; // Set the previous motion (the one before we stopped the object)
     rigidBody.angularVelocity = prevAngularVelocity;
 }
 

But if you want to completely stop the motion, then you should use the rigidbody.isKinematic property, which enable you to disable the physics for the specified rigidbody. This would give you the following code:

 [SerializeField]
 private Rigidbody rigidBody; // The rigidbody to stop
 [SerializeField]
 private float delay = 1f; // The delay to wait
 private Vector3 prevVelocity;
 private Vector3 prevAngularVelocity;
 
 // Use this for initialization
 void Start()
 {
     StartCoroutine(StopCoroutine());
 }
 
 IEnumerator StopCoroutine()
 {
     yield return new WaitForSeconds(delay);
 
     prevVelocity = rigidBody.velocity;
     prevAngularVelocity = rigidBody.angularVelocity;
     rigidBody.isKinematic = true; // Stop physics for this rigidbody
 
     yield return new WaitForSeconds(delay);
 
     rigidBody.velocity = prevVelocity;
     rigidBody.angularVelocity = prevAngularVelocity;
     rigidBody.isKinematic = false; // Enable physics for this rigidbody
 }

Regards,

 public float time;
 bool move = true;
 public List <Vector3> pos = new List<Vector3>();

 void Update () {
     if (move) {
         move = false;
         StartCoroutine(wait_move());
     }
 }

 IEnumerator wait_move(){
     for (int i = 0; i < pos.Count; i++) {
         yield return new WaitForSeconds (time);
         transform.position = pos [i];
         //adjust rotation
     }
     move = true;
 }