part 1 of 2 Two billiard balls with identical masses and sliding in opposite directions have an elastic head-on collision. Before the collision, each ball had a speed of 26 cm/s. a) Find the velocity of the billiard ball ini- tially moving to the right immediately after the collision. Answer in units of cm/s. part 2 of 2 b) Find the velocity of the billiard ball ini- tially moving to the left immediately after the collision. Answer in units of cm/s