Phase at mean position \(=0\)

Phase at mid point

\(\frac{A}{2}=A \sin \phi\)

\(\phi=\frac{\pi}{6}\)

Time it takes to travel a phase difference of \(\phi\)

\(t=\frac{2 \pi}{\omega} \times \frac{\phi}{2 \pi}\)

or \(t=\frac{\phi}{\omega}\)

or \(t=\frac{\pi}{6 \omega}\)

Average speed \(=\frac{\text { Total distance }}{\text { Time taken }}\)

\(=\frac{A / 2}{\pi / 6 \omega}\)

\(=\frac{3 A \omega}{\pi}\)