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FA = 12 N
FB = 5 N
DIT : R ?
dijawab :
a. 45 derajat
R = √(F1²+F2² + 2xF1F2cosα)
= √(12²+5² + 2x12x5x cos 45
= √169 + 60√3
= √229√3 N
b. 90 derajat
R = √(F1²+F2² + 2xF1F2cosα)
= √(12²+5² + 2x12x5x cos 90
= √169 + 0
= √169
= 13 N