Problem $1(10$ points$)$

In the mechanism shown below, link $2$ is rotating CCW at the rate of $4ra\frac{d}{s}($constant$).$ In the position shown, link $2$ is horizontal. link lengths: $AB=1\mathrm{.}25in,BC=2\mathrm{.}5in,CD=2\mathrm{.}5$ in$,{}_3=2\mathrm{.}5ra\frac{d}{s}CCW,{}_4=1\mathrm{.}5ra\frac{d}{s}CW.$

Determine $a_c,{}_3,$ and ${}_4.$ Using graphical method