Mass and velocity are scalar quantities, whereas velocity and momentum are vector quantities.
What is a scalar magnitude?
A scalar quantity is any measurement that can be defined only by its magnitude (e.g., density, speed, volume, mass, etc).
Mass measures the matter in a given object, whereas matter is something that contains mass.
Speed is a physical property of the matter indicating how quickly an object is moved without regard its direction.
Mass is a scalar quantity because it is associated with magnitude, and speed is also a scalar quantity of a velocity vector.
Conversely, velocity is the speed of a given object that moves in a given direction, it is a vector quantity because it involves magnitude and direction.
Finally, momentum is a value obtained by multiplying the mass of an object by its velocity, it is also a vector quantity that has a magnitude and direction.
In conclusion, mass and velocity refers to scalar quantities, whereas velocity and momentum can be defined as vector quantities.
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