A Swimmer Swims 20 Laps in a North-South Facing Pool

Multiple Choice

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.