An object of mass$=72\mathrm{.}57$kg starts at the top of a $225$m tall building. The object is then dropped off the building. Calculate the velocity of the object when it is at a height of $100$m$.$ Account for air resistance and gravity. Air density $=1\mathrm{.}293$ kg$/$m$\mathrm{³}$ and Coefficient of drag $=0\mathrm{.}4.$ Surface Area of the object $=1\mathrm{.}9$m$\mathrm{²}.$