What do you mean by time of flight?

Explanation

### Step-by-Step Solution:

1. **Definition of Time of Flight**: Time of flight refers to the total time a projectile spends in the air from the moment it is launched until it returns to the same horizontal level.

2. **Understanding Projectile Motion**: When an object is thrown into the air (for example, upwards), it follows a curved path known as a projectile motion. The object will rise to a certain height and then fall back down due to gravity.

3. **Journey of the Projectile**: The time of flight is specifically concerned with the entire journey of the projectile. This includes both the ascent (the time taken to reach the highest point) and the descent (the time taken to return to the original level).

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