In order to answer this, we would have to know what the 5 time periods to which you refer.
Time does not affect speed. Measures of speed may be changed over different time periods but that is not the same thing.
Which country? Buddhism is over 2,500 years old and has spread to all continents over that time.
how the anemometer changed over time
The laws of physics have not changed over time. Our understanding of them has changed over time.
how has coal mining changed over time
The monetary system in the Philippines is quite diverse. It has changed over time and has even gone through periods of inflation.
People changed over time by growing up.
graves change over long periods of time because of sedimentary rock.
Evolution is the change in species over long periods of time.
no they have changed over time. no they have changed over time.
data collected over several time periods is what type of data?
You can read about the different schools of Buddhism here: http://en.wikipedia.org/wiki/Schools_of_Buddhism