The 10 lb block A travels to the right at v(A)= 2 ft/s at the instant shown. if the coefficient o...

The 10 lb block A travels to the right at v(A)= 2 ft/s at the instant shown. if the coefficient of kinetic friction is μ= 0.2 between the surface and A, determine the velocity of A when it has moved 4 ft. Block B has a weight of 20 lb.