$18\mathrm{.}25($a$)$ What is the total translational kinetic energy of the air in an empty room that has dimensions $8\mathrm{.}00$ m $*12\mathrm{.}00$ m $*4\mathrm{.}00$ m if the air is treated as an ideal gas at $1\mathrm{.}00$ atm? $($b$)$ What is the speed of a $2000$ kg automobile if its kinetic energy equals the translational kinetic energy calculated in part $($a$)?$