Merry Go Round Problem

Dec 2019
13
0
us
wer3.PNG

I'm pretty sure I did part A right (please check), how should I do part b?
 
Apr 2008
3
1
isn't energy = work = $(1/2)I\omega^2$ ?
Then total energy would be $E_1 + E_2$ ?
I'm probly wrong but I get 5.4 rev/min for part a.
 
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