Which of the following quantities are always negative in a simple harmonic motion? (a) \( \vec{F...

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Which of the following quantities are always negative in a simple harmonic motion?
(a) \( \vec{F} \cdot \vec{a} \).
(b) \( \vec{v} \cdot \vec{r} \).
(c) \( \vec{a} \cdot \vec{r} \)
(d) \( \vec{F} \cdot \vec{r} \).
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