To analyze this situation, consider two bodies moving along the x axis: one of mass m1 moving with initial velocity v1i, and one of mass m2 moving with initial velocity \(v_{...To analyze this situation, consider two bodies moving along the x axis: one of mass m1 moving with initial velocity v1i, and one of mass m2 moving with initial velocity v2i. The question is: given the masses m1 and m2 and initial velocities v1i and v2i, what is the final velocity v of the combined mass? Before the collision, the initial momentum pi of the system is the sum of the momenta of all the bodies in the system: