Question

directions: select the correct speed. an archery range calculated the average speed of wooden arrows shot during a competition. which is the best representation of the average speed?

Explanation:

Step1: Consider reasonable speed - units

Arrows in archery competitions have relatively high - speed. Units like $\frac{mm}{hr}$ are too small for arrow speeds, and $\frac{mm}{sec}$ with a very small coefficient like $5.6\times 10^{-3}$ is also too slow.

Step2: Analyze the appropriate option

The speed of an arrow in an archery competition is likely to be in the range of several meters per second. Converting $5.6\times 10^{3}\frac{mm}{sec}$ to $\frac{m}{sec}$, we know that $1m = 1000mm$, so $5.6\times 10^{3}mm=5.6m$. So $5.6\times 10^{3}\frac{mm}{sec}=5.6\frac{m}{sec}$, which is a reasonable speed for an arrow.

Answer:

$5.6\times 10^{3}\frac{mm}{sec}$