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m = 5 kg
α = 30⁰
g = 10 m/s^2
gaya normal = ?
N = W . cos 30⁰
N = m.g.cos 30⁰
N = 5.10. 1/2√3
N = 25√3 N
maka gaya normalnya 25√3 N
semoga membantu ^_^