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f(y) = 80 sin 37 = 80 x 0,6 = 48 N
R = √64² + 48² + 2.64.48 cos 90
= √4096 + 2304
= √6400
= 80 N
F1 = 80 N
α = 37⁰
R = ?
Fx = 80 .cos 37⁰ = 80 .4/5 = 64 N
Fy = 80.sin 37⁰ = 80,0,6 = 48 N
maka
R^2 = ΣFx^2 + ΣFy^2
R^2 = 64^2 + 48^2
R^2 = 4096 + 2304
R^2 = 6400
R = √6400
R = 80 N
maka Resultannya 80 N
semoga membantu ^-^