Answer:
both astronomy and alchemy
Explanation:
Physics can be defined as the field or branch of science that typically deals with nature and properties of matter, motion and energy with respect to space, force and time.
Alchemy can be defined as a primitive field of natural science or philosophy that typically deals with the conversion of ordinary (base) metals into gold or lead into gold, as well as finding a cure for diseases. Also, Alchemy paved or gave room for the study of the composition and structure of matter with respect to chemical reactions.
Before the field of physics was officially defined, it was a mixture of both astronomy and alchemy.
This ultimately implies that, physical science was a broad field of science that comprises of both astronomy and alchemy during the medieval period.
