Problem
Pin P slides in a circular slot cut in the plate shown at a constant relative speed $u = 90$ mm/s. Knowing that at the instant shown the angular velocity $\omega$ of the plate is 3 rad/s clockwise and is decreasing at the rate of 5 rad/s$^2$, determine the acceleration of the pin if it is located at (a) Point A, (b) Point B, (c) Point C.