Speed:
Speed is the time taken to travel the distance. Speed is calculated by: Speed= distance/time. It has only magnitude but no direction so it is a scalar quantity.
Velocity:
Vector is the displacement travelled by an object in a time. It is called vector quantity as it has both magnitude and direction. Velocity is measured by: Velocity = Displacement/time.
Differences:
| Basis | Speed | Velocity |
|---|---|---|
| Definition (www.oxforddictionaries.com) |
The rate at which someone or something moves or operates or is able to move or operate | The speed of something in a given direction |
| Synonyms | Celerity, alacrity, tear, run, quicken | Rapidity, rush, momentum, clip, fleetness, quickness |
| Antonyms | Delay, slow, deliberation, halt, hesitate | Awkwardness, deliberateness, dilatoriness, ineptness, dally |
| Types | Its types are:
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| Word origin | The word origin speed was originated from Old English spēd (noun), spēdan (verb), from the Germanic base of Old English spōwan ‘prosper, succeed’, a sense reflected in early usage. | The word velocity was originated from Late Middle English: from French vélocité or Latin velocitas, from velox, veloc- ‘swift’. |
| Types of quantity | It is a scalar quantity. | It is a vector quantity. |
| Change of Direction | The object can change direction and the average speed will continue to count. | The object must follow one direction, if the direction of an object changes so do the velocity. |
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