A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
A. 0; 0.
B. 0; 2.38 m/s, south.
C. 0; 2.38 m/s, north.
D. 1 000 m, south; 2.38 m/s, south.
E. 1 000 m, north; 2.38 m/s, north.
Answer: A
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