Question

Two vector both equal in magnitude have there Resultant in equal in magnitude of the eightin. Find the angle between the two vectors.​

Answer 1

Answer:

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Answer 2

Explanation:

Let θ be the angle between the two vectors A and B such that, |A| = |B|.

Therefore, R2=A2+B2+2ABcosθ

=>A2=A2+A2+2AAcosθ

=>A2=A2+A2+2AAcosθ

[∵∵ |A| = |B| = |R|]

=>A2=2A2+2A2cosθ

=>A2=2A2+2A2cosθ

=>cosθ=−12=>θ=120∘