A mass m = 21 kg block is attached to a cord that is wrapped around the rim of a flywheel of mass M, radius R = 0.20 m, and hangs vertically as shown. The rotational inertia of the flywheel is 0.50 kg · m². When the block is released and the cord unwinds, the acceleration of the block is nearest to:
0.63g
0.62g
0.61g
0.60g
0.59g
0.57g
none of the above