D Question 21 Two identical cylindrical disks have a common central axis. Initially one of the disks is spinning about this axis. When the two disks are brought into contact, they stick together. Which of the following is true? O The total angular momentum is unchanged, but the total kinetic energy is reduced to half its original value. O Both the total kinetic energy and the total angular momentum are reduced to half of their original values. O The total kinetic energy and the total angular momentum are unchanged from their initial values. O The total angular momentum is reduced to half its original value, but the total kinetic energy is unchanged. O The total angular momentum is unchanged, and the total kinetic energy is reduced to one-quarter of its original value stion 22 ronayt

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A:

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A:

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