1. a. this gragh means that he raised the flag gradually and consistently over time.
b. this graph means that the flag was raised at a faster rate.
c. this gragh means that he raised the flag, then paused, raised, then paused continuously.
d. this graph means that the flag was raised at a slower rate.
e. this graph means that the flag was raised slower in the middle of the pole than at the beginning and end.
f. this graph means that he raised the flag within seconds, as in it went straight up in no amount of time.
2. I think a is the most realistic situation because it makes sense that he consistently pulled the flag up and it happened gradually over time.
3. I think f is the least realistic situation because it doesn't make sense that he raised the flag that fast and in one pull.