1determine the impulse exerted on the plate of prob 1831

Question

1.Determine the impulse exerted on the plate of Prob. 18.31 during the impact by 
(a) The obstruction at point B, 
(b) The support at point A.

Problem 18.31: A circular plate of radius a and mass m supported by a ball-and-socket joint at point A is rotating about the y axis with a constant angular velocity ω = ω0j when an obstruction is suddenly introduced at point B in the xy plane. Assuming the impact at point B to be perfectly plastic (e = 0), determine immediately after the impact (a) the angular velocity of the plate, (b) the velocity of its mass center G.