What are the similarities between speed and velocity?

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Speed is the ratio of the distance traveled over the time taken to travel. It gives us an idea of how fast an object is moving. It is a scalar quantity. That is, it only has a magnitude but no direction. Velocity is the ratio of displacement and the time taken for this motion. It gives us an idea of how fast the object is changing its position. Velocity is a vector quantity and has both magnitude and direction. 

Speed and velocity both represent a way to measure the change in position of an object relative to time. In fact, for a straight line motion, the speed and velocity of an object are the same (since distance and displacement will be the same). Speed and velocity are measured in the same units: meters per second or m/s. 

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