If $\vec{P}+\vec{Q}=\overrightarrow{0}$, then which of the following is necessarily true?
If $\vec{P}+\vec{Q}=\overrightarrow{0}$, then which of the following is necessarily true?
- A
$\vec{P}=\overrightarrow{0}$
- B
$\vec{P}=-\vec{Q}$
- C
$\vec{Q}= 0$
- D
$\vec{P}=\vec{Q}$
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