Conserving angular momentum,
Li = Lf
(1.24 x 10^-3) (0.298) = ( (1.24 x 10^-3) + (5 x 10^-3 x 0.826^2)) wf
wf = 0.0794 rad/s
change in w = wf - wi
= 0.0794 - 0.298
= -0.21856 rad/s
You are right. Just missed a negative sign.
Kindly upvote:)
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