A 2.0kg block hangs from a light cord wrapped around a uniform solid cylinder of mass 4.0kg and radius 0.25m. The cylinder is free to rotate about its fixed horizontal axle. If the block is released from rest, what is the magnitude of its downward linear acceleration? (Assume the cord does not slip.)
a) $9.8\,\text{m}\!/
\!\text{s}^{2}$
b) $3.3\,\text{m}\!/
\!\text{s}^{2}$
c) $4.9\,\text{m}\!/
\!\text{s}^{2}$
d) $6.5\,\text{m}\!/
\!\text{s}^{2}$