Final answer:
The subject of this question is Physics, and the elevator height options refer to the minimum elevation at which heavy floor equipment can be raised. The concept of work in physics is relevant to explain the differences in lifting the equipment to different heights.
Step-by-step explanation:
The subject of this question is Physics.
Alternate elevating heavy floor equipment to different heights involves the application of physical principles. The height options provided - 5 feet, 10 feet, 15 feet, and 20 feet - refer to the minimum elevation at which the equipment can be raised.
In Physics, the concept of work is relevant here. More work is required to lift the equipment to a higher height. For example, lifting the equipment to a height of 20 feet requires more work than lifting it to a height of 5 feet.