Determine the angular acceleration ${}_{AB}($positive if counterclockwise, negative if clockwise$)$ of link $AB$ and the linear acceleration of $A($positive if to the right, negative if to the left$)$ for $=90$ if ${}^{}=0$ and ${}^{}=3\mathrm{.}0ra\frac{d}{s^2}$ at that position. Carry out your solution using vector notation.

Answers:

${}_{AB}=ra\frac{d}{s^2}$

$a_A=\frac{m}{s^2}$