A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.11 kg, and the wedge has a mass of 5.39 kg. The ball is moving a speed of v = 4.45 m/s when it strikes the wedge, which is initially at rest
a) Assuming that the collision is instantaneous and perfectly elastic, what is the velocity of the wedge after the collision?