A \(1.0\,\text{kg}\) lump of clay is sliding to the right on a frictionless surface with a speed of \(2\,\text{m/s}\). It collides head-on and sticks to a \(0.5\,\text{kg}\) metal sphere that is sliding to the left with a speed of \(4\,\text{m/s}\). What is the kinetic energy of the combined objects after the collision?