Here's why:
* Mass: Mass is a measure of how much matter an object contains. The more massive an object, the more inertia it has, meaning it takes more force to change its motion.
* Velocity: Velocity is the rate of change of an object's position, meaning how fast it's moving and in what direction.
The formula for momentum is:
Momentum (p) = Mass (m) x Velocity (v)
So, the greater the mass or velocity of an object, the greater its momentum.