What do we mean when we say that momentumis a vector

momentum is a vector quantity, it means we need both magnitude and directions to express the momentum of a moving body.

momentum = mass × velocity

( momentum is cross product of a scaler quantity which is mass and a vector quantity that is velocity resulting in momentum which is itself a vector quantity. )

explanation:

a fuel engine ( known as a gasoline engine in american english )is an internal combustion engine with spark ignition, designed to run on petrol (gasoline) and similar volatile fuels.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue