Optional Problem$3$:

The uniform $70kg$ beam is initially at rest on the ground as shown in the figure. applied to points $A$

a$)$ What is the type of beam motion when the shown and point $B$ simultaneously?

b$)$ Determine the magnitude and direction of the angular acceleration of the beam at this instant when the shown forces are applied to points A and point $B$ simultaneously and bar $AB$ leaves ground. Assume the beam as a uniform slender rod.