How fast you can run is a rate which applies only to you.
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Write up of geometry in real life
Some examples: Your velocity is the rate of change of distance (even if you don't think of it in that way). Your acceleration is the rate of change of velocity. Your pay rise is the rate of change of your pay (per year).
For example if you have a large distance or number like 200,000,000,000 and it becomes tedious to write, just write 2x1011 and It makes numbers shorter and easier to use and write
There is no such jar. Not in real life, at any rate; perhaps you are thinking about some phantasy story.
Velocity is the rate of change of position. Acceleration is the rate of change of velocity. How fast you spend money. How fast you do a certain job done, assuming it can be split into pieces. For example, wash dishes.