# Question #8c623

Jun 9, 2015

1) $o \to p$
Av(speed)$= 20 \frac{m}{s}$
Av(velocity)$= 20 \frac{m}{s}$
2) $o \to p \to o$
Av(speed)$= 20 \frac{m}{s}$
Av(velocity)$= 0 \frac{m}{s}$

#### Explanation:

I considered only the distance op (I didn't use oq).
The average velocity is the change of position $x$, indicated as $\Delta x$ (known as displacement), divided by the corresponding change in time $\Delta t$.
${v}_{a v} = \frac{\Delta x}{\Delta y} = \frac{{x}_{f} - {x}_{i}}{{t}_{f} - {t}_{i}}$
Where ${x}_{i}$ is the position at $o$ that I considered the origin ${x}_{1} = 0$.

The average speed $s$ is a little bit more subtle...it is the total distance travelled, $d$, divided by the time needed.
${s}_{a v} = \frac{d}{t}$

So you get: