## Algebra 2 (1st Edition)

$\approx24.559$ mph
Plugging in $R=5$ we get $5=0.00829s^2\\s^2=\frac{5}{0.00829}\\s=\pm\sqrt{\frac{5}{0.00829}}$ But $s$ must be non-negative, thus $s=\sqrt{\frac{5}{0.00829}}\approx24.559$