$1.$ A string directed at a $60\mathrm{.}0$ angle above the horizontal is attached to a $10\mathrm{.}0$ kg box on a horizontal surface and the string is pulled with a tension of $50\mathrm{.}0$ N$.$

The coefficient of kinetic friction between the box and the surface is $0\mathrm{.}150.$

Find the acceleration of the box.