The small 20-lb block is placed on the inclined plane and subjected to 6-lb and 15-lb forces

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The small 20-lb block is placed on the inclined plane and subjected to 6-lb and 15-lb forces that act parallel with edges AB and AC, respectively. If the block is initially at rest, determine its speed when t = 3s. The coefficient of kinetic friction between the block and the plane is μk = 0.2.

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