In 20 minutes, Kara ran 2.40 km on a treadmill facing due east. Relative to the treadmill, what were her displacement and average velocity during this time interval?
1) 0; 0
2) 0; 2.00 m/s
3) 2.40 km, east; 0
4) 2.40 km, east; 2.00 m/s, east
5) 2.40 km, west; 2.00 m/s, west
Answer: 5