(Solved): A circular cam is in contact with a rectangular lifter and used to intermittently operate a piece o ...

A circular cam is in contact with a rectangular lifter and used to intermittently operate a piece of equipment at the end of a lifter arm. The lifter is in contact with the highest point of the cam at the instant shown and the lifter is constrained to move only in the vertical direction. The cam has a radius of $r=5.0$ in and is rotating about point $O$, which is offset from the center by a distance $c=2.0\mathrm{in}$. The cam's angular position is measured from the positive $x$ axis and is positive clockwise. The angular velocity and acceleration are positive clockwise. Part A - Velocity of the lifter Find the linear velocity of the lifter with respect to point $O$ when the cam has an angular position of $?=25^{?}$ and is rotating with an angular velocity of $?=2.8\mathrm{rad}/\mathrm{s}$. Find the linear acceleration of the lifter with respect to point $O$ when the angle is $?=25^{?}$, the angular velocity is $?=2.8\mathrm{rad}/\mathrm{s}$, and the angular acceleration is $?=?2.0\mathrm{rad}/{\mathrm{s}}^2$. Express your answer to two significant figures and include the appropriate units. Enter positive value if the acceleration is upward and negative value if the acceleration is downward.