@ruslan10
Acceleration is a measure of how quickly an object increases or decreases its speed. For example, let's imagine that you are in the car. First you stand still, and then you start moving. This process, when the machine begins to increase its speed from zero to, say, 60 km/h, is a manifestation of acceleration. Similarly, when a car slows down, it is an example of negative acceleration or deceleration. In general terms, acceleration is the rate of speed change over a certain period of time.
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