Using energy considerations, calculate the average force $($in N$)$ a $63\mathrm{.}0$ kg sprinter exerts backward on the track to accelerate from $2\mathrm{.}00$ to $6\mathrm{.}00$ m$/$s in a distance of $25\mathrm{.}0$ m$,$ if he encounters a headwind that exerts an average force of $30\mathrm{.}0$ N against him.