$($b$)$ At the given instant as shown in Figure Q$1($b$),$ angular velocity of bar $AB$ is $40ra\frac{d}{s}$ anticlockwise. Determine:

$($i$)$ the angular velocity of rod $CD.$

$(6$ marks$)$

$($ii$)$ the magnitude of velocity at the midpoint of rod $BC.$

$(2$ marks$)$

Figure Q$1($b$)$

$($c$)$ Explain with reason whether do you agree with the statement $"$An object with constant nonzero acceleration can never stop and remain at rest". $(4$ marks$)$

$[$Total : $25$ marks$]$