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∑Fx = 4ma - 2ma
= 2ma
∑Fy = 2ma - 4ma
= - 2ma
R = √Fx² + Fy²
= √(2ma)²+(-2ma)²
= √8 (ma)²
= 2√2 ma
tan α = Fy/Fx
= - 2ma / ma --> KW IV
= - 1
α = 360 - 45
= 315