Block A has weight { W }_{ A } and block B has weight { W }_{ B } . If B is moving downward with a velocity { v }_{ B1 } at t = 0, determine the velocity of A when t = { t }_{ 1 } . The coefficient of kinetic friction between the horizontal plane and block A is { μ }_{ k } . Given: { W }_{ A } = 10 lb , { W }_{ B } = 3 lb , { v }_{ B1 } = 3 ft/s , { μ }_{ k } = 0.15 , { t }_{ 1 } = 1 s , g = { 32.2ft/s }^{ 2 }