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Physics

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    $\begingroup$ Now I get it. It is about final speed and average speed. And derivative is about instantaneous speed, which is a kind of final speed. Thanks a lot. Your lucid explanation helped me to understand the concept. $\endgroup$
    – Arafat
    Commented May 22 at 14:31
  • $\begingroup$ Instantaneous speed is not related to final speed at all. Say you have traveled with car 100km,dividing this by total time taken in a journey 1h, you get car average speed 100km/h. Now, what will be if you make such measurements constantly on smaller and smaller distances, say how much car covers $mm$ per $1 ms$? If car traveled at some particular point with SAME average speed then it passed that point with $28 mm/ms$ momentary speed. If you take limit $\Delta S/\Delta t$ when time lapse approaches zero, -you will get instantaneous speed of car at some particular travel point. Hope you get it. $\endgroup$
    – Agnius Vasiliauskas
    Commented May 22 at 16:58
  • $\begingroup$ Thumbs up, perfectly got it. $\endgroup$
    – Arafat
    Commented May 22 at 17:14