Can someone help me with this question? I have been trying to solve it, I cannot find the answer

V Part A The assembly consists of a 3-kg pulley A and 10-kg pulley B. Neglect the mass of the cord and treat the pulleys as thin disks. No slipping occurs. (Figure 1) If a 2-kg block is suspended from the cord, determine the distance the block must descend, starting from rest, in order to cause B to have an angular velocity of 7.5 rad/s. Express your answer to three significant figures and include the appropriate units. View Available Hint(s) ? 0.078 m Submit Previous Answers X Incorrect; Try Again Figure B 30 mme