Question: at ( b ) why dont we consider WA * sin ( 5 ) ? I mean, why not UA = ( T - fiction

at (b) why dont we consider WA*sin(5)?
I mean, why not
UA=(T-fiction-WAsin5)d?
work-energy principle, work means net force's work. isn't it??????
at ( b ) why dont we consider WA * sin ( 5 ) ? I

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