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Speed is a scalar quantity that measures how fast an object is moving. Velocity, on the other hand, is a vector quantity that measures how fast an object is moving in a specific direction.

Speed is the rate at which an object covers distance, usually measured in metres per second (m/s) or kilometres per hour (km/h). It is a scalar quantity because it only has magnitude and no direction. For example, if a car travels 100 km/h, we know how fast it is going, but we don't know which direction it is going in.

Velocity, on the other hand, is a vector quantity because it has both magnitude and direction. It is the rate at which an object changes its position in a specific direction, usually measured in metres per second (m/s) or kilometres per hour (km/h). For example, if a car travels 100 km/h north, we know how fast it is going and in which direction it is going.

Another difference between speed and velocity is that speed can be constant, while velocity can change even if the speed remains constant. This is because velocity takes into account the direction of motion, so if an object changes direction, its velocity changes even if its speed remains the same.

In summary, speed is a scalar quantity that measures how fast an object is moving, while velocity is a vector quantity that measures how fast an object is moving in a specific direction. Velocity takes into account both speed and direction, while speed only measures how fast an object is moving.

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