The figure shows the edge view of a uniform concrete slab with a mass of 12 Mg. The slab...

The figure shows the edge view of a uniform concrete slab with a mass of 12 Mg. The slab is being hoisted slowly by the winch D with cable attached to the dolly. At the position θ = 60°, the distance x from the fixed ground position to the dolly is equal to the length L = 4 m of the slab. If the hoisting cable should break at this position, determine the initial acceleration a_A of the small dolly, whose mass is negligible, and the initial tension T in the fixed cable. End A of the slab will not slip on the dolly.