A Thin, 100-M-Long Rod of Mass 1

Multiple Choice

A thin, 1.00-m-long rod of mass 1.00 kg has a solid sphere of radius 0.25 m and mass 0.50 kg attached to one end. The arrangement is originally vertical and stationary, with the sphere at the top. The system is free to pivot about the bottom end of the rod after being given a slight nudge. The speed of the sphere after the system rotates through 90^o is

A) 1.10 m/s.
B) 1.22 m/s.
C) 1.80 m/s.
D) 3.14 m/s.
E) 5.53 m/s.