Two metal disks, one with radius r1 = 2.60 cm and mass m1 = 0.900 kg and the other with radius r2 = 5.00 cm 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 2.40 m above the floor, what is its speed just before it strikes the floor