ColiderProblem

using UnityEngine;
using System.Collections;

public class Bola : MonoBehaviour {

    public Rigidbody2D corpoDaBola;
    public Rigidbody2D PlayerUm;
    public float VelBolax;
    public float VelBolay;

    // Use this for initialization
    void Start () {
        PlayerUm = GetComponent<Rigidbody2D> ();
        corpoDaBola = GetComponent<Rigidbody2D> ();
        corpoDaBola.AddForce (new Vector2(0.05f,0.05f));
    }

    // Update is called once per frame
    void Update () {
        VelBolax = corpoDaBola.velocity.x;
        VelBolay = corpoDaBola.velocity.y;
    }

    void OnCollisionEnter2D (Collision2D colisao){

        if ((colisao.gameObject.tag == "Player")){

            if ((VelBolax < 19f) && (VelBolax > -19f) && (VelBolay < 19f) && (VelBolay > -19f)) {
                corpoDaBola.velocity = corpoDaBola.velocity + PlayerUm.velocity / 10;
            }
        }

    }
}