**Newton's First Law of Motion:**

Newton's First Law of Motion, also known as the law of inertia, states that an object at rest will remain at rest, and an object in motion will continue moving with a constant velocity unless acted upon by an external force.

**Deducing the First Law from the Second Law:**

The Second Law of Motion, also known as Newton's Law of Acceleration, relates the acceleration of an object to the net force acting on it and its mass. It can be mathematically expressed as:

F = ma

where F represents the net force applied to an object, m is the mass of the object, and a is the acceleration produced.

To deduce the First Law from the Second Law, we need to consider a scenario where the net force acting on an object is zero.

1. **Scenario: Object at Rest**

Let's consider an object at rest. If the object is not subjected to any external force, the net force acting on it is zero (F = 0). According to the Second Law, when F = 0, the acceleration (a) of the object is also zero. Therefore, the object remains at rest, confirming Newton's First Law.

2. **Scenario: Object in Motion**

Now, let's consider an object in motion with a constant velocity. In this case, the object experiences no acceleration (a = 0). According to the Second Law, if a = 0, the net force acting on the object must also be zero (F = 0). Therefore, the object continues to move with a constant velocity, in accordance with Newton's First Law.

**Summary:**

From the Second Law of Motion, we can deduce Newton's First Law of Motion by considering scenarios where the net force acting on an object is zero. If an object is at rest or moving with a constant velocity and there is no external force acting on it, the object will remain at rest or continue moving with the same velocity. Newton's First Law essentially states that objects tend to maintain their state of motion unless acted upon by an external force.