Mass in motion is another way of describing which physical quantity?

1. Momentum belongs only to objects that are moving and that have mass. 2. It is calculated by multiplying the mass of the object by its velocity. 3. That is exactly what the phrase mass in motion is describing. 4. Velocity on its own says nothing about mass, so it cannot be the answer. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 2: Momentum and impulse_