void OnCollisionEnter2D(Collision2D col)
                {
                if (col.gameObject.tag == "HardFloor" && col.relativeVelocity.magnitude > 100)
                    {
                            Debug.Log ("There has been a collision!");
                            Destroy (col.gameObject);
                    }
                else if (col.gameObject.tag == "otherTarget")
                    {
                            Debug.Log ("There has been a collision!");
                            Destroy (col.gameObject);
                    }
                }