The opportunity afforded by a free hit ball enables the batsman to play a more powerful shot without the fear of getting out by the most common methods (caught or leg before wicket). The suspension of these opportunities for being out result in the delivery immediately after a foot-fault no-ball being termed a free hit. The fault lies with the fielding side, and the advantage is to the batting side. Also,if the ball did hit the stumps, the batsman could afford to steal single runs (a bye) because the ball is normally considered a dead ball.

Is it true that is there stump out in free hit ball?
no