Understanding the Concepts

* Newton's Second Law of Motion: This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Mathematically:

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

Calculations

1. Identify the knowns:

* Mass (m) = 45 kg

* Force (F) = 15 N

2. Rearrange the formula to solve for acceleration:

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

3. Substitute the values:

* a = 15 N / 45 kg

4. Calculate the acceleration:

* a = 0.33 m/s²

Answer: The acceleration of the 45 kg mass is 0.33 m/s².