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Two vectors have a resultant equal to either. The angle between them is ___________

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in Engineering Physics I by (558k points)
Two vectors have a resultant equal to either. The angle between them is ___________

(a) 60°

(b) 120°

(c) 90°

(d) 100°

The question was posed to me in quiz.

The origin of the question is Motion in a Plane topic in chapter Laws of Motion of Engineering Physics I

1 Answer

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Best answer
The correct choice is (b) 120°

Easy explanation: R = √(P^2+Q^2+2PQcosθ)

p^2 = 2p^2 (1+cosθ)

1+cosθ = 1/2

Cosθ = -1/2 = cos 120°

θ = 120°.

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