A pool ball having a mass of 0.204 kg is rolling to the right at a speed of 6.00 m/s if it strikes head on the other stationary pool ball. After this elastic collision, the incoming ball goes off to the left having a speed of 3.70 m/s.
(i) Determine what would be the speed of the ball which was initially idle after the collision? (Obtain the positive direction as to the right.)
(ii) Determine what would be the mass of that ball?