I linked you to wikipedia for a reason. You really have no clue what you're talking about.
Have you ever thrown a ball up in the air? I'm sure you have. Let's go through what happens..
The ball accelerates due to a force. Once it leaves your hand, your hand is no longer pushing it. Make sense? The only force acting on the ball, other than wind I suppose, is gravity. It would be completely moronic for me to assume that while the ball is accelerating up, that means it's never going to stop.