title: Increasing ball (object) speed
body: <p>I have create simple game.  How can I increase the speed of ball. Please help!</p>
  
  <blockquote>
    <p>-(void)BallMovement{</p>
  
  <pre><code>        [self ComputerMovement];
          [self Collision];
  
          football.center = CGPointMake(football.center.x + X, football.center.y + Y);
  
          if (football.center.x &lt; 15) {
              X = 0 - X;
          }
  
          if (football.center.x &gt; 305) {
              X = 0 - X;
          }
  
          if (football.center.y &lt; 0) {
  
              PlayerScoreNumber = PlayerScoreNumber + 1;
              PlayerScore.text = [NSString stringWithFormat:@"%i", PlayerScoreNumber];
  
              [timer invalidate];
              StartButton.hidden = NO;
              button.hidden = NO;
              football.center = CGPointMake(147, 250);
  </code></pre>
  </blockquote>