(Kinesiology is the study of the movement of the human body. Notice the connection to the word kinematics.) She determines the
velocity of an experimental subject while he runs along a straight
line at a constant rate. The kinesiologist starts the stopwatch at
the moment the runner passes a given point and stops it after the
runner has passed another point 20 m away. The time interval
indicated on the stopwatch is 4.0 s.
(a) What is the runner’s velocity?
(b) If the runner continues his motion after the stopwatch is stopped,
what is his position after 10 s have passed