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Question
Which of the following quantities are always positive in a simple harmonic motion?
Options
\[\vec{F} . \vec{a} .\]
\[\vec{v} . \vec{r} .\]
\[\vec{a} . \vec{r} .\]
\[\vec{F} . \vec{r} .\]
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Solution
\[\vec{F} . \vec{a} \]
As the direction of force and acceleration are always same,
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