A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.30 kg, and the wedge has a mass of 4.70 kg. The ball is moving a speed v = 4.6 m/s when it strikes the wedge, which is initially at rest (see the figure). Assuming that the collision is instantaneous and perfectly elastic, what are the velocities of the ball and the wedge after the collision?