Which situation shows zero average velocity but nonzero average speed ?

Going 20m east then 20 m west back to start in 20s

A runner’s position changes from +10m to –30m (east positive) in 8s . What are the average speed and average velocity? (Motion is straight, no stops.)

Speed = 5.0 m/s; Velocity = 5.0 m/s west

Speed = 2.5 m/s; Velocity = 5.0 m/s west

Speed = 5.0 m/s; Velocity = 2.5 m/s west

Speed = 2.5 m/s; Velocity = 2.5 m/s west

Bell Ringer Quiz 4 (Unit2 Week2) – TEKS 7.7B: Signs and Reference Direction | Quizalize