$2)$ We wrap a light, nonstretching cable around a solid cylinder with radius R $=2$ m$$and moment of inertia I $=4$ kg m$2.$ The cylinder rotates with negligible friction about a stationary horizontal axis. We tie the free end of the cable to a block of mass m $=1$kg and release the block from rest at a distance h $=1\mathrm{.}6$ m$$above the floor. As the block falls, the cable unwinds without stretching or slipping. What$$s the linear acceleration of the block m before it strikes the floor.