Question

If resultant of two vectors is perpendicular to small vector then find angle between these vectors.
Ratio of their magnitude is 2.​

Answer 1

Answer:

B=A2+B2+2ABcosθ ....(i)

∴tan90o=A+BcosθBsinθ⇒A+Bcosθ=0

∴cosθ=−BA

Hence, from (i) 4B2=A2+B2−2A2⇒A=32B

⇒cosθ=−BA=−23∴θ=150o

Explanation:

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