The velocity distribution in the gap is linear, Mechanical Engineering

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A 10 kg block slides down a smooth inclined surface as shown in Figure. Show the terminal velocity of the block if the 0.1 mm gap among the block and the surface have SAE30 oil at 20°C. Suppose the velocity distribution in the gap is linear, and the area of the block in contact with the oil is 0.2 m2.

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