Question
Question: Given :\(\overrightarrow{R} = \overrightarrow{A} + \overrightarrow{B}\) and R = A = B. The angle bet...
Given :R=A+B and R = A = B. The angle between A and 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 = −21 Ž q = 1200