Question

No.18 aja yaa.please pake cara.

Answer 1

Cos (120°)=cos (180°-60°)
= -cos 60°
= -½
selisih vektor
|F1-F2|= √(F1²+F2²-2F1F2cos120°)
= √(40²+40²-2.40.40.(-½))
= √(3200+1600)
= √4800
= √(1600×3)
= 40√3 N