In a physics demonstration, Mr$.$ Van Dam tosses a volleyball downward at $6\mathrm{.}0$ m$/$s $[32\backslash$deg below the. horiz.$]$ out of a window. The ball takes $3\mathrm{.}4$ s to hit the ground. Calculate the following;

a$.$ The height of the window $[4$ Marks$]$

b$.$ The velocity of the volleyball just before it strikes the ground. $[5$ Marks$]$