Please prove the following values with your calculations with formulas

$($a$)$ k $=5\mathrm{.}575$ x $10^-6$ m$/$sec

$($b$)$ v $=3\mathrm{.}98$ x $10^-5$ m$/$sec

$($c$)$ void velocity $=1\mathrm{.}055$ x $10^-4$ m$/$sec