Question

average velocity 01 20 pts possible
part 1 of 2
after 13.8 s, a joggers displacement is 410 m.
what is the average velocity in m/s?
answer in units of m/s.
part 2 of 2
what is the average velocity in km/h?
answer in units of km/h.

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Explanation:

Step1: Recall average - velocity formula for part 1

The formula for average velocity $v=\frac{\Delta x}{\Delta t}$, where $\Delta x$ is displacement and $\Delta t$ is time. Given $\Delta x = 410$ m and $\Delta t=13.8$ s.
$v=\frac{410}{13.8}\text{ m/s}\approx29.71\text{ m/s}$

Step2: Convert units for part 2

We know that $1$ m = $0.001$ km and $1$ s=$\frac{1}{3600}$ h.
$v = 29.71\frac{\text{m}}{\text{s}}\times\frac{0.001\text{ km}}{\text{m}}\times\frac{3600\text{ s}}{\text{h}}= 106.956\text{ km/h}$

Answer:

part 1: $29.71$ m/s
part 2: $106.96$ km/h (rounded to two - decimal places)