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- Velocity is very much related to speed
- Velocity is a vector quantity while speed is a scalar quantity. For example if an object is moving in a circle at constant speed. its velocity will be different because of the direction change.
- Velocity is a vector physical quantity; both magnitude and direction are required to define it. The scalar absolute value (magnitude) of velocity is called "speed", a quantity that is measured in meters per second (m/s or m⋅s−1) when using the SI (metric) system.
- For the specialist, velocity is the rate of change of the position of an object, equivalent to a specification of its speed and direction of motion.
- To have a constant velocity, an object must have a constant speed in a constant direction.
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