$\mathrm{A\; 1}0$g fridge magnet is supposed to hold $2\mathrm{.}0$g paper on the stainless steel fridge door. The normal force of $0\mathrm{.}19$N is insufficient to keep them in place, and the paper and magnet accelerate down the fridge at $0\mathrm{.}150$m$/$s$^2$ when the fridge door is slammed. What is the coefficient of kinetic friction between the steel door and the paper?