1. The problem statement, all variables and given/known data Walt and Wolfie collide in bumper cars of mass 50 kg each. Walt has a mass of 78 kg, and Wolfie has a mass of 61 kg. Walt strikes Wolfie from the rear at V = 3.7 m/s. If the collision is elastic, Wolfie is initially at rest, and Walt's final speed is 0.2655 m/s in the same direction, what is Wolfie's speed after the collision? 2. Relevant equations m1*(u1^2)/2 = m1*(v1^2)/2 + m2*(v2^2)/2 3. The attempt at a solution 78*(3.7^2)/2 = 78*(0.2655^2)/2 + 61*(x^2)/2 and I get 4.17 m/s, but that doesn't seem right to me. Can anyone shed some light on this for me?