A thin plate, having a mass of 4 kg, is suspended from one of its corners by a ball-and-socket joint O. If a stone strikes the plate perpendicular to its surface at an adjacent corner A with an impulse of I_s = {-60i}N · s, determine the instantaneous axis of rotation for the plate and the impulse created at O.

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x I, = {-60i} N-s Z 200 mm 200 mm