$$ A $50$ kg sprinter, starting from rest, runs $50$ m in $7\mathrm{.}0$ s at constant acceleration.

What is the magnitude of the horizontal force acting on the sprinter?

What is the sprinter$$s power output at $2\mathrm{.}0$ s$,4\mathrm{.}0$ s$,$ and $6\mathrm{.}0$ s$?$