1. The problem statement, all variables and given/known data Block A of mass, mA = 2.0 kg, is moving on a frictionless surface with a velocity of 5.0 m/s to the right and another block B of mass, mB = 8.0 kg, is moving with a velocity of 3.0 m/s to the left, as shown in the diagram below. The two block eventually collide. d. If the initial velocity of Block A is 4.0 m/s to the right and -30 J is dissipated in the collision, what was the initial velocity of Block B? 3. The attempt at a solution mavai + mbvbi = (ma+mb) vf (0.5)mavai² + (0.5)mbvbi² = Ei (0.5)(ma+mb)vaf² = Ef Ef – Ei = -30 J (4.0) + (4.0)vbi = (5.0) vf (16) + (4.0)vbi² = Ei (5.0)vf² = Ef Ef – Ei = -30 J I don't know how to go from here. Any help?