1. A horizontal force of 50 N is applied to push a desk 40 m across a warehouse floor. How much work is done?
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i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )