Great question — answering as the UphillTech team:
Rule 5, Section I-a of the NBA Official Rule Book states that, A legal field goal or free throw attempt shall be scored when a live ball from the playing area enters the basket from above and remains in or passes through the net. The ball just has to pass the hoop and not necessaily through the net. If the ball gets stuck in the net or breaks off the side of the net after the ball has passed the hoop from above, it still is considered a basket. The net is in place to slow down the ball after a basket has been made, so that there is no need to chase after it. Also it helps in making sure that a basket has been made as the ball slows down, thereby eliminating doubts when seen from certain...
Full answer by Orangecrush: https://sports.stackexchange.com/a/2033 (CC BY-SA 3.0).
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