There is a ball at rest in your reference frame with a mass m. a second ball also with rest mass m is moving with speed vi. the two balls collide, stick together and continue on with a speed vr and a mass ms. keep in mind that the combined mass after the collision will not be 2m. a. write out the equation for conservation of relativistic momentum in terms of the initial and final speeds. (initial momentum- final momentum) b. write out the equation for conservation of relativistic energy in terms of the initial and final speeds. c. divide the equation from part a by the equation in part b. if done correctly the masses should be gone from the problem. solve for the final speed, vs, in terms of the initial speed, v d. from your answer to part c, find the approximate final speed in the limit of vi<