The small 20-lb block is placed on the inclined plane and subjected to 6-lb and 15-1b fo...

The small 20-lb block is placed on the inclined plane and subjected to 6-lb and 15-1b forces that act parallel with edges AB and AC, respectively. If the block is initially at rest, determine its speed when t = 3 s. The coefficient of kinetic friction between the block and the plane is = 0.2.