Define time of flight for a projectile .

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Concept of Time of Flight**:
- Time of flight refers to the total time a projectile remains in the air from the moment it is launched until it returns to the ground.

2. **Defining the Projectile Motion**:
- When a projectile is launched, it follows a curved path due to the influence of gravity. The motion can be broken down into two components: horizontal and vertical.

...