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Grade: 12
        If a and b are perpendicular vectors |a+b|=13 and |a|=5 what is value of |b|=?
10 months ago

Answers : (1)

Arun
15016 Points
							
Dear student
 
(A +B). (A+ B) = A.A + B.B + A.B + B.A
Now
|A+B|² = |A |² + |B |²  {A.B = B.A = 0}
169 = 25 + | B|²
|B| = 12
 
Regards
Arun (askIITians forum expert)
10 months ago
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