The rectangular block shown rotates about the diagonal $OA$ with an angular velocity of $4\mathrm{.}980ra\frac{d}{s}$ that is decreasing at the rate of $5\mathrm{.}07ra\frac{d}{s^2}.$ Knowing that the rotation is counterclockwise as viewed from $A,$ determine the velocity and acceleration of point $B$ at the instant shown. $($Include a minus sign if necessary.$)$

The velocity of corner $B$ is $(41\mathrm{.}83$ in$.\frac{?}{s}(in\frac{.}{s}$ in$./$s $)$k$.$

The acceleration of corner $B$ is $($ in$.$ in$.(($:$in\frac{.}{s^2}$