Cooper Section $8\mathrm{.}12\backslash$#$11$

I stood on the top of Cheadle Hall and threw an egg upwards. It landed on the ground after $3$ seconds. The height of the egg above Cheadle Hall after $\backslash ($ t $\backslash )$ seconds is $\backslash ($ h$($t$)=9$ t$-5$ t$^\{2\}\backslash )$ meters.

a$.$ What is the speed of the egg when it hit the ground?

$\backslash [$

$\backslash$text $\{$ Speed $\}=\backslash$mathrm$\{$m$\}/\backslash$mathrm$\{$s$\}$

$\backslash ]$

b$.$ After how many seconds is the speed of the egg zero for the first time?

After seconds

c$.$ How high is Cheadle Hall?

Cheadle Hall is meters high

d$.$ How high above the ground did the egg go$?$

The egg goes meters above the ground