Understanding the Concepts

* Mass: A measure of the amount of matter in an object (in kilograms, kg).

* Weight: The force of gravity acting on an object's mass (in Newtons, N).

* Acceleration: The rate of change of velocity (in meters per second squared, m/s²).

Newton's Second Law of Motion

Newton's Second Law of Motion states:

* Force (F) = Mass (m) * Acceleration (a)

Solving for Acceleration

1. Identify the given values:

* Mass (m) = 2 kg

* Weight (F) = 18 N

2. Use Newton's Second Law to solve for acceleration:

* a = F / m

* a = 18 N / 2 kg

* a = 9 m/s²

Therefore, the acceleration of the suitcase is 9 m/s².