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This is a really good question. Speed and velocity are similar. Velocity is just speed, but a direction is included. Say you are driving a car. Driving forward is positive velocity, while driving backwards is negative velocity. Speed is what a radar gun would show about the car either way, because it can't tell if the car is moving forward or backward. Therefore, you can have negative velocity, but there is no such thing as negative speed. A speed graph will always stay positive, while a velocity graph can go negative at some places, though it doesn't have to. HOPE THIS HELPS!!!

Addendum: Only in ONE-dimensional motion can "Velocity vs Time" graphs be truly drawn; as only in this dimension can direction be indicated by +/- sign. In 2-D and 3-D motion, the graph equivalent must be "Speed vs Time" because these graphs do not indicate direction.

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9y ago

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