Last Updated: 22 March 2026Verified for JEE 2026
PhysicsJEE & NEET
Difference Between Speed and Velocity
Speed and velocity are fundamental concepts in kinematics. While often used interchangeably in everyday language, they have distinct scientific definitions. Speed is a scalar quantity measuring how fast an object moves, while velocity is a vector quantity that includes both speed and direction.
Speed vs Velocity — Comparison Table
| Aspect | Speed | Velocity |
|---|---|---|
| Definition | Rate of change of distance | Rate of change of displacement |
| Type | Scalar quantity | Vector quantity |
| Direction | No direction | Has direction |
| Formula | Speed = Distance / Time | Velocity = Displacement / Time |
| Value | Always positive or zero | Can be positive, negative, or zero |
| SI Unit | m/s | m/s |
| Average | Total distance / Total time | Total displacement / Total time |
| Example | Car travels at 60 km/h | Car travels at 60 km/h North |
Key Points to Remember
Speed can never be negative; velocity can be negative (opposite direction)
For circular motion, average velocity is zero but average speed is non-zero
Instantaneous speed equals magnitude of instantaneous velocity
Speed ≥ |Velocity| always holds true
Exam Relevance
This topic falls under Kinematics in Physics for both JEE and NEET. Questions on the difference between speed and velocity appear frequently in competitive exams, both as direct MCQs and as part of numerical/assertion-reason problems.
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