$[$Problem I$]$

$(20$ points$)$

For the mechanism shown below, the velocity of point $A$ on link $2$ is $20i\frac{n}{s}$ as shown,

$1\mathrm{.}1$ Redraw the mechanism to a scale of your choice

$1\mathrm{.}2$ Draw the velocity polygon, $($scale $1cm$:$10i\frac{n}{s})$

$(5$ points$).$

$(5$ points$)$

$1\mathrm{.}3$ Determine the magnitude and direction of angular velocity of link $4$ in rad$/$s

$(5$ points$)$

I. $4$ Determine the velocity of point $D$ on link $5$

$(5$ points$)$

$A^{**}{B}^{**}=2\mathrm{.}5in$

$A^{**}A=0\mathrm{.}75in$

$AB=1\mathrm{.}75in$

$B^{**}B=1\mathrm{.}5in$

$C^{**}C=1\mathrm{.}5in$