Solution of task 9.8.8 from the collection of Kepe OE

Solution of task 9.8.8 from the collection of Kepe OE

9.8.8
The square ABCD makes a plane-parallel motion and at a given instant has an instantaneous acceleration center at point A, the angular velocity? = 1 rad / s and angular acceleration? = 1 rad / c2 Which angle in degrees with the Ox axis constitutes the acceleration vector of the point C? (Answer 180)