Final answer:
Positive pressure ventilation is the best way to rapidly reinflate a collapsed lung. Oxygen therapy can also be provided along with positive pressure ventilation to ensure an adequate oxygen supply.
Step-by-step explanation:
The best way to rapidly reinflate a person's collapsed lung is to give positive pressure ventilation. By applying positive pressure to the airways, it helps push air into the collapsed lung, allowing it to reinflate. Oxygen therapy can also be provided along with positive pressure ventilation to ensure an adequate oxygen supply.