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I know Fnorm=mg*cos theta Fnorm=692.8N

Is the mu=0.298 because Ffriction=mu*Fnorm ---> 200N=mu*692.8N

I also know Fparallel=mg*sin theta Fparallel= 400N

How do I find Fnet???

I don't know what to do from there!! Can anybody help??!! Please and thank you!!