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What is the defining difference between a scalar and a vector?
Scalars only have magnitude; vectors have both magnitude and direction.
Is 'Speed' a scalar or a vector?
Scalar. It lacks direction.
Is ‘Velocity' a scalar or a vector?
Vector. It includes both speed and direction.
In vector diagrams, what does the length of the arrow represent?
The magnitude of the quantity.
If you have a vector of 5 km North, what would -5 km North represent?
5 km South (the opposite direction).