==> ${v_{\max }} = \frac{{2 \times \pi \times 2}}{2} = 2\pi \,\,m/s$
$x\left( t \right) = A\,\sin \,\left( {at + \delta } \right)$
$y\left( t \right) = B\,\sin \,\left( {bt} \right)$
Identify the correct match below
(where $g =$ acceleration due to gravity)