Question:
If two equal vectors have the resultant vector R either vector then find the angle between two vectors
Answer:
Let the magnitude of the two vectors be R each. And let θ be the angle between them.
Then, magnitude if their resultant will also be R.
Using the formula for magnitude of the resultant,
R² = R² + R² + 2.R.R.cosθ
-R² = 2R²cosθ
cosθ = -1/2
Hence θ= 120°
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