Question

Two forces, each of magnitude F have a

resultant of the same magnitude F. The

angle between the two forces is

a. 45°

b. 120°

c. 150°

d. 60°​

Answer 1

R= A 2+B 2 +2ABcosθ

By substituting, A=F,B=F and R=F we get

cosθ= 2−1

∴θ=120°....

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Answer 2

Answer:

B option (120°) is the correct answer.

Explanation:

R=

A

2

+B

2

+2ABcosθ

By substituting, A=F,B=F and R=F we get

cosθ=

2

−1

∴θ=120

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