What is correctness of a measurement?

Answer 1

Velocity is measured by distance traveled divided by the time taken to travel.

Unlike speed Velocity contains vectors, which means you can have a negative velocity.

For example if a car traveled to the right 6 meters in 3 seconds velocity would be 2 meters per second or 2 m/s

An example showing the vector (Direction) would be a car traveled 6 meters to the left in 3 seconds. -6/3= -2 m/s