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Question

Question: Given :\(\overrightarrow{R} = \overrightarrow{A} + \overrightarrow{B}\) and R = A = B. The angle bet...

Given :R=A+B\overrightarrow{R} = \overrightarrow{A} + \overrightarrow{B} and R = A = B. The angle between A\overrightarrow{A} and B\overrightarrow{B} is –

A

(a) 600

A

(b) 900

A

(c) 1200

A

(d) 1800

Explanation

Solution

(c)

R2 = A2 + B2 + 2AB cosq ...(i)

R = A = B

A2 = A2 + A2 + 2A2cosq

cosq = 12- \frac{1}{2} Ž q = 1200