Momentum is a vector quantity as it is the product of mass and velocity of an object. Mass is a scalar quantity but velocity is vector. In physics, the symbol for momentum is P, and its units are kilogram meters per second and gram centimeters per second.
Any physical quantity that has magnitude as well as direction is called a vector quantity. Mass has only magnitude but velocity is always in a specific direction. As an example, if a 2 kilogram ball is moving with a velocity of 5 meters per second in the eastward direction, its momentum is obtained as follows.
P = mass x velocity = 2 kilograms x 5 meters per second = 10 kilogram meters per second in the eastward direction. It is important to mention direction with momentum.