Question $[2]$: The rodAB has a mass of $10$ kg $.$ As a result of the rotation of crank C $($disk C $),$ rod AB oscillates in vertical plane. In the position shown, the rod $AB$ has an angular velocity $=10ra\frac{d}{s}($cw$)$ and angular acceleration of $=20ra\frac{d}{s^2}(ccw).$ Neglect the mass of connecting link between the disk and rod $AB,$ determine:

a$)$ The force exerted by the link between the rod and the crank, $[10$ marks$]$

b$)$ The reaction force at support A $[10$ marks$]g=9\mathrm{.}81\frac{m}{s^2}.$