A ball with the mass of 180gr is moving 26 km/hr to the right on a pool table it collides with another ball of a mass of 150gr and the velocity of 15km/hr to the left. The velocity of the first ball after the collision is 10km/hr to the right. What is the velocity and direction of the 2nd ball after the collision?

the problem with that equation is the angle is of great importance but assuming angle one is the same of angle 2, 5.76923 km/hr
anther issue is if you had spin, masse, and the even the friction of the felt on the table changes the algorithm in which the telemetry would be exhibited