Poime Oase is placed on the ground, the surface is frictionless. Two boxes are placed on the slopes and connected by a rope which passes the pulley on the base. The mass of box B is m. The height of the boxes at the beginning is V3 h, the free fall constant is g. a. First, we fix the base to the ground. The mass of box A is m. Then release them at the same time. Find the magnitude of velocity when A slide to the ground. b. Second, the base is not fixed to the ground. And box A is replaced by another box which has an adjustable mass. The whole system is reset. We release the boxes and apply a force to the whole system such that the system moves together horizontally. To prevent box A and B from sliding relative to the base, the acceleration and the mass of box A must be adjusted to specific values. Find the mass of box A and the magnitude of the acceleration in this case.