How are speed and velocity different? velocity tells you how fast and gives a direction. speed only tells how fast. speed is a vector and velocity is a scalar. speed tells you how fast and gives a direction. velocity only tells how fast. speed is constant and velocity can change.

Velocity tells you how fast and in what direction. Speed only tells how fast.

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 : )

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