Momentum As A Vector:

Assume that the speed of an object (in meters per second) is v, and that the mass of the object (in kg) is m. Then the magnitude of momentum p is their product:

p = mv

This is not the entire story. To fully explain momentum, the direction and also the magnitude should be defined. This means that we should consider the velocity of the mass in terms of its speed and direction. (A 2 kg brick flying via your east window is not similar as a 2 kg brick flying via your north window.) If we let v symbolize the velocity vector and p symbolize the momentum vector, then we can say that

p = mv