$5-4$ Fig. P$5-1$ shows a plate cam with translatingin$-$line roller follower and a plate

cam with translating offset roller follower. $R=100mm,OA=20mm,e=10mm,r_T=10$

$mm.$ Indicate the pressure angles and the displacements of the follower when the cam rotates

$90$ from the position shown in Fig. P $5-1.$

$($a$)$

$($b$)$