Answer:
D. [tex]6.0\frac{m}{s}[/tex]
Explanation:
The average speed is defined as the relationship between the displacement made by a body and the total time it took to perform it. The formula that will allow you to calculate the average speed is: [tex]v=\frac{x}{t}[/tex] where [tex]v[/tex] is the average velocity, x is the displacement, and t is the time elapsed.
Solving the exercise with [tex]x=18m[/tex] and [tex]t=3s[/tex]
[tex]v=\frac{18m}{3s}=6.0\frac{m}{s}[/tex]
