void Mad() {

    float rocketSpeed = 2000;
    Rigidbody2D bulletInstance = Instantiate(rocket, transform.position, Quaternion.Euler(new Vector3(0, 0, 0))) as Rigidbody2D;
    Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
    Vector3 dir = Input.mousePosition - pos;
    bulletInstance.transform.LookAt(dir);



    myRigidbody = GetComponent<Rigidbody2D>();
    myRigidbody.AddForce(bulletInstance.transform.forward * rocketSpeed);