Question

2. If |A + B| = |A| + |B| then angle between A
and B will be
(A 90
(B 120

Answer 1

Answer:

120 is the Answer please mark me as brainlist

Answer 2

we know, |A - B| = √{|A|² + |B|² - 2|A||B|cos\thetaθ }

where \thetaθ is angel between A and B.

given, |A - B| = |A| - |B|

so, √{|A|² + |B|² - 2|A||B|cos\thetaθ } = |A| - |B|

squaring both sides,

|A|² + |B|² - 2|A||B|cos\thetaθ = |A|² + |B|² - 2|A||B|

or, -2|A||B|cos\thetaθ = -2|A||B|

or, cos\thetaθ = 1 = cos0°

or, \theta=0^{\circ}θ=0

∘

hence, option (B) is correct.