Final answer:
Aircraft ground spoilers are powered by the hydraulic system, which typically includes a motorized pump that does most of the work, similar to systems in power brakes and bulldozers.
Step-by-step explanation:
The ground spoilers on an aircraft are typically powered by the plane's hydraulic system. This system often includes a motorized pump that does the majority of the work, moving hydraulic fluid under pressure to actuate the spoilers. Much like in other heavy machinery, such as power brakes and the systems found in bulldozers, this pump ensures that the workload is efficiently managed, allowing for precise control of the spoilers to improve safety and aerodynamics during critical phases such as landing or in response to wind gusts or turbulence.