Linear momentum is defined as a system's mass multiplied by its:

1. Momentum captures both how much matter is moving and how fast. 2. Linear momentum is defined as the product of a system's mass multiplied by its velocity. 3. Because velocity is a vector, momentum is a vector too. 4. Acceleration and displacement are different quantities entirely. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 8 'Linear Momentum and Collisions', sections 8.1-8.7_