Question

Please note that this problem has 2 parts.
2 unknows in conservation of momentum and 2 unknows in conservationof kinetic energy

Walt and Wolfie collide in bumper cars of mass 50 kg each. Walt hasa mass of 60 kg, and Wolfie has a mass of 80 kg. Walt strikesWolfie from the rear at V = 7.9 m/s. If the collision is elastic,and Wolfie is initially at rest, what is Wolfie's speed after thecollision (in m/s)? Assume that the collision is "one-dimensional",i.e., all the motion is in the "x" direction.