Instantiate a Gameobject and AddForce to it (Rigidbody2D)

I need to instantiate a GameObject at certain intervals from an empty gameobject called spawnpoint and add force to the instantiated object. With the script that I have written the initiated gameobject spawns and seems to move along the correct vector but after traveling for like 2 centimetres it almost like hits an invisible wall and falls down, even with a force of lets say 10000. The script is attached to the empty gameobject called spawnpoint. What should I do? I've read many answers here concerning the same subject but none of them have helped. Here's the code I have now:

 public class BombSpawnAddForce : MonoBehaviour {
 
     public Transform spawnPoint;
     public GameObject ballPrefab;
     public float delay = 0.01f;
     public float force = 0.01f;
 
 
 
 
     void Start () 
     {
         
         InvokeRepeating ("Spawn", delay, delay);
         
     }
 
 
 
     void Spawn() 
     {
 
         GameObject ballInstance;
         ballInstance = Instantiate (ballPrefab, spawnPoint.transform.position, spawnPoint.rotation) as GameObject;
         ballInstance.rigidbody2D.AddForce(new Vector2 (3,5) * force);
     }
 
 
 
 }