## Velocity

**Velocity is defined as a measure of the distance an object travels in a stated direction in a given length of time.**

Thus velocity is speed in a stated direction. **Velocity is referred to as a vector quantity because it possesses both size and direction, the size being speed**.
Where speed only tells us how fast or slow an object is moving it gives no reference of direction velocity is used as a more complete measure as it not only gives speed but also the direction.

Two cars could be travelling with the same speed of 100 km/h on a motorway. However, by stating one car is travelling 100 km/h north and the other 100 km/h south do we realise they are travelling in opposite directions, thus the velocity gives a better indication of the motion.

The average velocity of an object can be determined from the equation below: