Mass m1=27.1 kg is on a horizontal surface, connected to mass m2= 7.10 kg by a light string which is hanging. The pulley has negligible mass and no friction. A force of 232.9 N acts on m1 at an angle of 31.7 degrees. The coefficient of kinetic friction between m1 and the surface is 0.213. Determine the upward acceleration of m2.