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## Homework Statement

A biologist looking through a microscope sees a bacterium at r1→ = 2.2i + 3.7j -1.2kμm.

After 6.2s, it's at r2→ = 4.6i + 1.9kμm.

a)What is it's average velocity

b) What is its average speed

## The Attempt at a Solution

a)

v→= Δr/Δt

v = (r2-r1)/6.2 = (2.4i - 3.7j + 3.1k)μm/6.2s

= (0.387i -0.596j + 0.5k) μm^-1

b)

|v| = Δs/Δt

|v| = SQRT[(2.4)^2i + (-3.7)^2j + (3.1)^2k]/6.2s

= 0.869μms^-1