A thin disk is spinning around a post (the post is not spinning, just the disk). An identical disk is dropped onto the spinning disk from above. The 2"d disk is not spinning initially, but sticks to the first disk and begins to spin along with the first disk. This is drawn to the right. [10 points] a. How does the angular momentum of the two-disk system change after the 2"d disk is dropped onto the first? Is it a Wi of quarter as much, half as much, the same, twice as much, or four times as much? Explain your answer. [3 points] b. How does the angular velocity for the lower disk change when the 2"d is dropped onto it? How does the angular velocity of the upper disk change after it is dropped onto the lower disk? Explain your answers for both disks. [4 points] c. How does the rotational kinetic energy of the two-disk system change after the 2"d disk is dropped onto the first? Is it a quarter as much, half as much, the same, twice as much, or four times as much? Explain your answer. [3 points]