how fast is the tip of a whip
Whipcracking Recently, an additional, purely geometrical factor was recognized: the tip of the whip moves twice as fast at the loop of the whip, just like the top of a car's wheel moves twice as fast as the car itself.[2][3]
Bull riding The flank strap
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Marcus Álvarez