Answer
(a) He traveled a distance of 150 meters.
(b) The displacement is 95.5 meters to the east.
Work Step by Step
(a) Since he ran half of the circumference, he traveled a distance of 150 meters.
(b) The displacement is the length of the track's diameter (to the east). We can find the length of the diameter $d$:
$d = \frac{300~m}{\pi} = 95.5~m$
The displacement is 95.5 meters to the east.
