how many free throws

[DrPete]

Once the shot is clearly released, there is no more player control or team control (ie no offensive players). Fouls are penalized like any other common foul (ball out of bounds or free throws depending on the total team foul count for the half).
Whether the shot attempt by A1 goes in (it would count) or not has no bearing on the number of free throws.
As far as calling two separate fouls on the same team..... once one foul is called, then you have a dead ball situation, so the second foul would have to be intentional or flagrant to be considered. Usually one foul would suffice in this type of situation.