A Thin Rod of Mass M and Length L Is

Multiple Choice

A thin rod of mass M and length L is struck at one end by a ball of clay of mass m, moving with speed v as shown in the figure. The ball sticks to the rod. After the collision, the angular momentum of the clay-rod system about A, the midpoint of the rod, is:

A) (m + M/3) (vL/2)
B) (m + M/12) (vL/2)
C) (m + M/6) (vL/2)
D) mvL/2
E) mvL