A runner dashes 263m in a direction due North from the starting line (Xi = 0m). She then turns around and runs due South back toward the starting line 62m. If both legs of this run take a total of 203 seconds, to the nearest tenth of a m/s, what is her average velocity?

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

Positrons are spontaneously emitted from the nuclei of

In which of the following is positive work done by a person on a suitcase