A kid throws a coin off the willis tower $($h$=324$ m$)$ with a downward velocity of magnitude V$0=11$ m$/$s$.$

 The time in second that it takes the coin to fall is $7\mathrm{.}100.$ find the speed at which the coin strikes the ground Vf in meters per seconds using the initial velocity, V$0,$ and the drop distance, h$?$