Explanation:

- Velocity refers to the speed of something in a particular direction.

- Option 1: Flight

- Typically refers to the act of flying or moving through the air.

- Not directly related to speed or velocity.

- Option 2: Race

- Indicates a competition of speed.

- It's not an exact synonym for velocity, as it implies competition.

- Option 3: Speed

- Synonymous with velocity in terms of the rate of movement.

- Indicates how fast something is moving without specifying direction.

- Correct Answer because speed perfectly aligns with the concept of velocity.

- Option 4: Hurry

- Describes a rushed or swift action.

- Does not specifically refer to the measurement of speed.