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"Inge H. A. Pettersen" writes:
: "What is the reason for using >the letter s to denote distance
traveled ?".
The letter "d" is usually used for distance. For example , "A boy
walks 100 meters north and then 100 meters south. What is the total
distance that he walked?"
The letter "s" is usually used for displacement. Regardless of the
distance
that the boy walked, if he ends up at the same spot he started from,
his displacement is zero.
Herb Gottlieb from New York City
(Where we have many displaced persons from all over the world living
here)