4-2. A double
pulley, with a mass of 
and a radius of
gyration around its center of 
, consists of two parts connected to each other. The portion
with 
is
connected to block B, 
, while the portion with 
is connected to block A, 
. If the weight of the cables is negligible and they do
not slip, find the kinetic energy of the system when 
clockwise.
Solution:
Therefore, 
. Ans.