Please solve answers correctly

1. Two blocks with masses ma = 5.00 kg and mz = 7.00 kg are attached by a string as shown below. The pulley, which turns on a frictionless axle, has a mass of 2.00 kg and a radius of 0.050 m. The horizontal surface has a coefficient of kinetic friction, 0.350. Find the speed of the system when the block of mass ma has dropped 2.00 m. (For a hoop, I = Mr?) a 2. A merry-go-round modeled as a disk of mass 100. kg and radius R = 2.00 m is rotating in a horizontal plane about a frictionless, vertical axle. M After a student with mass m = 60.0 kg jumps on the rim of the merry-go-round, the system's angular speed decreases to 2.00 rad/s. if the student walks slowly from the edge toward the center, find the angular speed of the system when she R reaches a radius of 0.500 m from the center. b. Find the change in the system's rotational kinetic energy caused by her movement to r = 0.500 m. C. Find the work done on the student as she walks to r = 0.500 m