using UnityEngine;
using System.Collections;

public class BallScript : MonoBehaviour {

        private bool ballIsActive;
        private Vector3 ballPosition;
        private Vector2 ballInitialForce;

        // GameObject
        public GameObject playerObject;

        // Use this for initialization
        void Start () {
            // create the force
            ballInitialForce = new Vector2 (100.0f,300.0f);

            // set to inactive
            ballIsActive = false;

            // ball position
            ballPosition = transform.position;
        }

        // Update is called once per frame
        void Update () {
            // check for user input
            if (Input.GetButtonDown ("Jump") == true) {
                // check if is the first play
                if (!ballIsActive){
                    // reset the force
                    GetComponent<Rigidbody2D>().isKinematic = false;

                    // add a force
                    GetComponent<Rigidbody2D>().AddForce(ballInitialForce);

                    // set ball active
                    ballIsActive = !ballIsActive;
                }
            }

            if (!ballIsActive && playerObject != null){

                // get and use the player position
                ballPosition.x = playerObject.transform.position.x;

                // apply player X position to the ball
                transform.position = ballPosition;
            }

            // Check if ball falls
            if (ballIsActive && transform.position.y < -6) {
                ballIsActive = !ballIsActive;
                ballPosition.x = playerObject.transform.position.x;
                ballPosition.y = -4.2f;
                transform.position = ballPosition;

                GetComponent<Rigidbody2D>().isKinematic = true;
            }

        }
    }


sing UnityEngine;
using System.Collections;

public class PlayerScript : MonoBehaviour {

    public float playerVelocity;
    private Vector3 playerPosition;
    public float boundary;

    // Use this for initialization
    void Start () {
        // get the initial position of the game object
        playerPosition = gameObject.transform.position;
    }

    // Update is called once per frame
    void Update () {
        // horizontal movement
        playerPosition.x += Input.GetAxis("Horizontal") * playerVelocity;

        // leave the game
        if (Input.GetKeyDown(KeyCode.Escape)){
            Application.Quit();
        }

        // update the game object transform
        transform.position = playerPosition;

        // boundaries
        if (playerPosition.x < -boundary) {
                        transform.position = new Vector3 (-boundary, playerPosition.y, playerPosition.z);
                }
        if (playerPosition.x > boundary) {
            transform.position = new Vector3(boundary, playerPosition.y, playerPosition.z);
        }

    }
}