Two equal vectors, each of magnitude P, have a resultant of magnitude P. Find the angle between them in degrees.
Physics · Mathematical tools and vector · Vector
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Question

Two equal vectors, each of magnitude P, have a resultant of magnitude P. Find the angle between them in degrees.

G1 Physics · Accepted Answer

P=2P cos(θ/2), so cos(θ/2)=1/2. Hence θ=120°.