Question

Two vectors a and b are such that vector A+ B = A- B. Then select the incorrect statement
1) A.B = 0
2) A × B = 0
3) A = 0
4) B = 0

With explanation pls ...

Answer 1

Answer:

A

Explanation:

if we put formula √asquare + bsquare + 2abCosФ = √asquare+bsquare-2abCosФ

we get Ф=45

therefore A.B cannot be zero as it is zero only at Ф=90

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