Two metal disks, one with radius R₁ = 2.60 cm and mass M₁ = 0.800 kg and the other with radius R₂ = 5.00 cm and mass M₂ = 1.60 kg, are welded together and mounted on a frictionless axis through their common center.

A. What is the total moment of inertia of the two disks? Express your answer with the appropriate units.

B. A light string is wrapped around the edge of the smaller disk, and a 1.50 kg block is suspended from the free end of the string. If the block is released from rest at a distance of 2.80 m above the floor, what is its speed just before it strikes the floor? Express your answer with the appropriate units.

C. Repeat part B, this time with the string wrapped around the edge of the larger disk. Express your answer with the appropriate units.