(Answered) At a given instant the 10-lb block a is moving downward

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At a given instant the 10-lb block A is moving downward with a speed of 6 ft/s. Block B has a weight of 4 lb, and the coefficient of kinetic friction between it and the horizontal plane is μk = 0.2. Neglect the mass of the cord and pulleys. Determine the speed of the block A 2.3 s later.

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