2 m/s 5 m/s 20 m/s 25 m/s
I gave my students this multiple choice question: Anna ran 100 meters in 20 seconds. What was her average speed?

Only one answer is correct among these 4 choices:
- 2 m/s
- 5 m/s
- 20 m/s
- 25 m/s

Could you tell me which one is correct?

5 m/s