$1.$ A typical billboard is $4$ m x $14\mathrm{.}5$ meters. What is the force on a $10$C fall day from a $30$ m$/$s second windstorm when it is blowing

a$.$ At the billboard $($normal to the surface only hitting one side$)(5$pts$)$

b$.$ Over the billboard $($tangential to the surface across both sides$)(5$pts$)$