The bacterium E. coli is a single-cell organism that lives in the gut of healthy animals, including humans. When grown in a uniform medium in the laboratory, these bacteria swim along zigzag paths at a constant speed of 20 μm/s. Figure P3.40 shows the trajectory of an E. coli as it moves from point A to point E. What are the magnitude and direction of the bacterium’s average velocity for the entire trip?

Transcribed Image Text:

y (um) 40 C 20 B A 0- x (um) 100 20 40 60 80 - 20 E -40