Question

so i need to calculate the moment of inertia of the pulley and the angular
acceleration of the pulley.

mass A = 9kg
Mass B = 15kg
Inner pulley= Mass 3kg R= 6cm
Outerpulley= mass 7kg R=12cm

it is a composite pulley with two masses hanging. Mass A on the outer pulley held by a tension on the left side, and another Mass B on the inner pulley held by a tension on the right side.


Now i know that I= 1/2MR^2
T=IW ( angular acceleration)
T=RF
do i use F=Ma for this and body diagrams? then add them up?
im very confused on this . thank you for the help!