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$(30$ points$)$ Boxes A and B are connected by a rope$-$and$-$pulley system, as shown. As soon as the system is released from rest, the motion occurs. The surface between A and the inclined floor is smooth. The surface between B and the horizontal floor is rough $)=(0\mathrm{.}3.$ As soon as the system is released from rest, the motion occurs. Calculate the velocity of box A $2$ seconds after the system is released from rest.