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the two properties are: speed and direction.

speed: ex: you pass from 10 km/h to 20km/h. you have a delta v (=10km/h) and you have a time line during which the object is changing its velocity.

direction: the "velocity" seems to stay the same. ex: you travel with a car in a circle... even though u can see on the control board of the car that the car travels with 50 km/h, the car will accelaerate as the velocity depends on the displacement. and as u change the direction of the displacement ur velocity vector will change and therefore you will have an acceleration (centrifugal and centripetal forces will also play a role in the equation)

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