Question

the angle between two vector of equal magnitude is 120° prove that the magnitude of their resultant is equal to eitheir of them give answer​

Answer 1

Answer:

I hope you will understand

Explanation:

answer is in pic

Answer 2

Step-by-step explanation:

• Let two vectors of equal magnitude be A. The angle between two vectors is 120.
• Resultant between can be given by,

$value of cos120 = \frac{-1}{2}$

$R = \sqrt{A^{2} + A^{2} + 2 A.Acos\ 120 } \\R = \sqrt{A^{2}+ A^{2}+2A^{2} \frac{-1}{2} } \\R= \sqrt{A^{2}+ A^{2} -A^{2} } \\R= \sqrt{A^{2} } \\R= A$

Therefore,the magnitude of resultant is equal to the magnitude of vector.

Hence proved.

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