$11\mathrm{.}2-$kg object moving with a speed of $8\mathrm{.}0\frac{m}{s}$ collides perpendicularly with a wall and emerges with a speed of $6\mathrm{.}0\frac{m}{s}$ in the opposite direction. If the object is in contact with the wall for $2\mathrm{.}0$ ms $,$ what is the magnitude of the average force on the object by the wall?

$8900$ N

$4800$ N

$9800$ N

$1200$ N

$8400$ N