1-d elastic collision at relativistic speeds. let m,-1kg, v,-0.5ck; m2 -2kg, v2-0.6ck. they collided. the final masses did not change. find the final velocities: v, andv,' (note: this is similar to taylor's example 15.10 but not exactly the same. in this situation, the second mass was not initially at rest). (hint: find the cm velocity. transform to the cm-frame. "solve the conservation of momentum and energy in the cm frame" and therefore find the final momenta. transform back to lab-frame. extract the final velocities from the final momenta in the lab-frame.) reminder: once you calculated your v, and v, . plug back into the equations to confirm that momentum and energy are conserved.