A vector vec(A) When added to the vector...

A vector `vec(A)` When added to the vector `vec(B)=3hat(i)+4hat(j)` yields a resultant vector that is in the positive y-direction and has a magnitude equal to that of `vec(B)`. Find the magnitude of `vec(A)`.

A

`sqrt10`

B

10

C

5

D

`sqrt15`

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The correct Answer is:

A

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