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Rod AB is attached to a collar at A and is fitted with a wheel at B that has a radius r= 15 mm. Knowing that when \theta= 60° the colar has velocity of 250 mm/s upward and the speed of the collar is decreasing at a rate of 150 mm/{ s }^{ 2 }, determine (a) the angular acceleration of rod AB, (b) the angular acceleration of the wheel.

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