[BillyMac]

I'll give it a shot. NFHS rules.

A1 shoots a jumper. While the try is in the air, B1 pushes A2 in the back.
Ball has been released on the try, so count the basket by A1.
If Team A is in the bonus, A2 gets a one-and-one, or if Team A is in the double bonus, A2 gets two shots.
If Team A is not in the bonus, Team A gets the ball for a designated spot throwin nearest the foul.

A1 shoots a jumper. While the try is in the air, A2 pushes B1 in the back.
Ball has been released on the try, so count the basket by A1.
If Team B is in the bonus, B1 gets a one-and-one, or if Team B is in the double bonus, B1 gets two shots.
If Team B is not in the bonus, Team B gets the ball for a run-the-endline throwin anywhere on the endline.

All of the above assumes that the ball was released on the try when the foul occurred. If the ball was not released, then continuous motion may apply, team control may apply, and all bets are off. Let's see if my answers above are correct before we go down the "before release" path.