Final answer:
The long backboard should be employed first to extricate a PT from an automobile with a suspected cervical spine injury.
Step-by-step explanation:
The mechanical aid that should be employed first to extricate a PT from an automobile with a suspected cervical spine injury is 2) long backboard. A long backboard provides proper support and stabilization for the entire body, including the cervical spine, during extrication. It helps to minimize further movement and potential damage to the injured person's spine.