no one cares
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The fact that the question was asked is an indication that at least one person cares. In fact, it has been asked before. So just because you (original answerer) do not care does not mean that others do not.
"M" stood for the Modulus of slope.
You can call it s if you want to but m has been the standard - it stands for "modulus" and is commonly used to indicate slope
Because of the Slope-Intercept equation. The model of any line can be described by the formula y=mx+b. The m is a number that represents the slope of a line. Whoever discovered the equation chose m instead of s. Probably because s usually represents the summnation of a series of numbers, so the mathemetician chose m to prevent confusion.
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Simply put, a velocity time graph is velocity (m/s) in the Y coordinate and time (s) in the X and a position time graph is distance (m) in the Y coordinate and time (s) in the X if you where to find the slope of a tangent on a distance time graph, it would give you the velocity whereas the slope on a velocity time graph would give you the acceleration.
The average slope in that interval is('y'-value at 30 s) - ('y'-value at 10 s)/20 s
You can call it s if you want to but m has been the standard - it stands for "modulus" and is commonly used to indicate slope
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 5 words with the pattern M-M-S-S. That is, seven letter words with 1st letter M and 3rd letter M and 5th letter S and 7th letter S. In alphabetical order, they are: mimeses mimesis mimosas momisms momuses
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern S--M---M. That is, eight letter words with 1st letter S and 4th letter M and 8th letter M. In alphabetical order, they are: shamosim
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -S-MM-S. That is, seven letter words with 2nd letter S and 4th letter M and 5th letter M and 7th letter S. In alphabetical order, they are: tsimmes
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern M-A--M-S. That is, eight letter words with 1st letter M and 3rd letter A and 6th letter M and 8th letter S. In alphabetical order, they are: mwalimus
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern M--S----M. That is, nine letter words with 1st letter M and 4th letter S and 9th letter M. In alphabetical order, they are: marsupium mausoleum menstruum midstream
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern M-SSMA-. That is, seven letter words with 1st letter M and 3rd letter S and 4th letter S and 5th letter M and 6th letter A. In alphabetical order, they are: messman
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern M---SMAS. That is, eight letter words with 1st letter M and 5th letter S and 6th letter M and 7th letter A and 8th letter S. In alphabetical order, they are: melismas
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern ---M-AM-S. That is, nine letter words with 4th letter M and 6th letter A and 7th letter M and 9th letter S. In alphabetical order, they are: plumdamas
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern M--S-AM-. That is, eight letter words with 1st letter M and 4th letter S and 6th letter A and 7th letter M. In alphabetical order, they are: misstamp
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern M-MMA--S. That is, eight letter words with 1st letter M and 3rd letter M and 4th letter M and 5th letter A and 8th letter S. In alphabetical order, they are: mammatus
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern MES--M-S. That is, eight letter words with 1st letter M and 2nd letter E and 3rd letter S and 6th letter M and 8th letter S. In alphabetical order, they are: mesdames mestomes