Physics, asked by ayeshauzair25, 11 months ago

If A vector & B vector two non collinear unit vectors and if if a + b is √3 find the value of (A vector -B vector).(2A vector + Bvector)

Answers

Answered by aryanbalotiya

Answer:

√14

Explanation:

answer is attached below

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Attachments:

aryanbalotiya: i am sorry the correct ans is 1/2

aryanbalotiya: you have to solve (a-b)(2a+b)= 2a sq. + ab - 2ab - b sq.

aryanbalotiya: as we know a and b are unit vectors so, 2a sq. = 2, -b sq. = -1

aryanbalotiya: we can write -a.b = -ab.cos theta coz a.b = abcos theta

aryanbalotiya: from the above attachment you can see cos theta = 1/2 so -ab.cos theta = -1/2

aryanbalotiya: now put all the values

aryanbalotiya: 2 - 1/2 - 1 = 1/2 hence your ans is 1/2

aryanbalotiya: and sorry for the inconvenience

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