Which of the following options is true regarding momentum?

Momentum is defined as the product of an object's mass and its velocity. This definition highlights that momentum is directly related not just to the mass of an object but also to its speed, which incorporates both the magnitude and direction of its movement. Therefore, the correct choice emphasizes that momentum is not merely dependent on mass alone; it requires an understanding of how fast and in what direction that mass is moving.

In addition, momentum is a vector quantity, meaning it has both magnitude and direction, which is important in understanding how different forces acting on an object can change its momentum. This dynamic aspect makes concepts like change in velocity significant in various physical contexts, such as collisions and motion.

The other options highlight elements that are either incomplete or inaccurate in the context of momentum's fundamental definition and principles.