A fluid is at a point $6\mathrm{.}5$ m above a reference datum, the fluid pressure is $1800$ N m$-2,$ and the flow velocity is $3\mathrm{.}4$ x $10-5$ m$/$s$.$ The fluid density is $1\mathrm{.}01$ x $103$ kg m$-3.$

a$)$ What is the total energy per unit mass?