Velocity is one of the properties of a BasePart. You can edit it by going into the properties of a brick, or use a script, and change the Velocity property, which requires a Vector3 value. Some useful ways of using Velocity can be for trampolines, moving water, or conveyor belts. You can make a conveyor belt/moving water by editing X or Z depending on which way to you want it to go, and you can make a trampoline by editing Y.

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