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Two blocks and a pulley are connected by...

Two blocks and a pulley are connected by inextensible cords as shown. The relative velocity of block A with respect to block B is 0.8 m/s to the left at time t = 0 and 0.4 m/s to the left when t = 0.25 s. Knowing that the angular acceleration of the pulley is constant, the relative acceleration of block A with respect to block B is?

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