Tolong dijawab teman-teman nmr 5 & 6 pakai cara.jawaban kalian sangat saya butuhkan

5.)
ΣF = 0
W sin 30° - N μs = 0
W sin 30° - W cos 30° μs = 0
W sin 30° = W cos 30° μs
sin 30° = cos 30° μs
1/2 = 1/2√3 μs
μs = 1/√3
μs = 1/3 √3 (b)