Vector3.cs

using UnityEngine;

public class VectorScript : MonoBehaviour
{
    void Update()
    {
        Vector3 from = Vector3.right * -5f; //現在地
        Vector3 to = transform.position; //目的地
        float smoothTime = Time.deltaTime * 0.1f;   //移動スピード

        Vector3 vel = Vector3.zero; //現在の速度

        transform.position = Vector3.SmoothDamp(from, to, ref vel, smoothTime);
    }
}