Final answer:
Ladders can serve various purposes such as work platforms, ramps, and scaffold planking. Inclined planes are more efficient than ladders for moving objects to greater heights.
Explanation:
Ladders are versatile structures that can be used for work platforms, ramps, or as scaffold planking. Inclined planes or ramps make it easier to move objects to a greater height without acceleration compared to using a ladder. They were likely utilized in constructions like the Egyptian pyramids to transport heavy stone blocks.
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