Question

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Answer 1

Explanation:

if each force having same magnitude,

then resultant between F¹ and F³ is

F¹³ = √( 25 + 25 + 2 x5 x 5 cos 120⁰)

= √ ( 50 - 25)

= 5

resultant between F¹³ and F² Is zero because 180⁰ is the angle between them.