Question

solve please


kindly don't spam

Answer 1

Hey Mate

your answer is --

Let, A and B are two vectors .

Given, A = B ......(1)

Let, B is the resultant

Let, angle between them is @

So,

√A^2+B^2+2ABcos@ = B

=> √B^2+B^2+2B^2cos@ = B ( from 1)

=> 2B^2 + 2B^2cos@ = B^2

=> 2B^2(1+cos@) = B^2

=> 1 + cos@ = 1/2

=> cos @ = (1/2)-1

=> cos@ = -1/2

=> cos@ = cos120° [ since, cos120°=-1/2]

=> @ = 120°


Hence, angle between two vectors is 120°


【 Hope it helps you 】

Answer 2

Heya!!Here is your answer friend ⤵⤵
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Please refer to the attachment