A Wheel Has a Radius of 0

Multiple Choice

A wheel has a radius of 0.40 m and is mounted on frictionless bearings.A block is suspended from a rope that is wound on the wheel and attached to it (see figure) .The wheel is released from rest and the block descends 1.5 m in 2.00 s without any slipping of the rope.The tension in the rope during the descent of the block is 20 N.What is the moment of inertia of the wheel?

A) 3.5 kg • m²
B) 3.7 kg • m²
C) 3.9 kg • m²
D) 4.1 kg • m²
E) 4.3 kg • m²