The state in which the speed of a body increases is calledacceleration. When thisspeed increases in equal measure over equal time periods, it is called constant acceleration. When we say that the speed of a body increases in direct proportion to the passage of time, it means that the speed of a body increases equally over equal time periods.

Example :When an Airplane flies in velocity of 250 meters per second (900 kilometers per hour), and after a minute it flies 280 m/s and after one more 310 m/s (1116 k/h), we say it moves in uniform acceleration. its velocity increases equally: Every minute its velocity increases in 30 meters per second.

Factor

ais theacceleration, and it determines the speed added to the body over each time period.

In our example, the acceleration(a) is 0.5meters per second squared -

The state in which the speed of a body decreases is called deceleration. The term acceleration is often also used to describe the behavior of a body decreasing its speed. In this case we say that the body has negative acceleration.

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