The formula to calculate the speed of the ball is given to be:
[tex]s=\frac{d}{t}[/tex]where s is the speed, d is the distance, and t is the time.
From the question, we have:
[tex]\begin{gathered} d=100\text{ meters} \\ t=14\text{ seconds} \end{gathered}[/tex]Therefore, the speed is calculated to be:
[tex]s=\frac{100}{14}=7.14\text{ meters per second}[/tex]To convert from meters per second to miles per hour, we multiply the value by 2.237.
Therefore, the speed will be:
[tex]\begin{gathered} s=7.14\times2.237 \\ s=15.97 \end{gathered}[/tex]The speed is 15.97 miles per hour.