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Under what condition |vec(A)+vec(B)| = |...

Under what condition `|vec(A)+vec(B)| = |vec(A)|+|vec(B)|` holds good?

A

`vec(A) and vec(B)` act in the same direction.

B

`vec(A) and vec(B)` act in the opposite direction.

C

`vec(A) and vec(B)` are different physical quantities.

D

`vec(A) and vec(B)` have same magnitude.

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The correct Answer is:
A
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