Problem $106.$ The T$-$shaped body rotates about a horizontal axis through point $O.$ At the instant represented, its angular velocity is $=5ra\frac{d}{sec}$ and its angular acceleration is $=10ra\frac{d}{s^2}$ in the directions indicated. Determine the velocity and acceleration of $($a$)$ point A and $($b$)$ point B$.$ Express your results in terms of components along the $x-$and $y-$axes shown. Repeat the previous problem, but now express your results in terms of components along the normal and tangential directions $(n-$and $t-$axes$).$