Final answer:
The unit of momentum in the International System of Units (SI) is kilograms meters per second (kg·m/s), also expressed as kgm⁻¹.
Step-by-step explanation:
The unit of momentum is a concept fundamental to understanding motion in Physics. By definition, momentum (p) is the product of an object's mass (m) and its velocity (v), given by the equation p = mv. Considering that mass is measured in kilograms (kg) and velocity in meters per second (m/s), the SI unit for momentum is, therefore, kilograms meters per second, or kg·m/s.
This is often expressed as kgm⁻¹, where the exponent ⁻¹ indicates per second (s⁻¹). This is directly aligned with Newton's second law of motion stating that the external force applied on an object is equal to the rate of change of momentum, emphasizing the correlation between force, mass, and acceleration (a), where the unit of force, the Newton (N), breaks down to kg·m/s².