Physics
posted by M .
Two balls are involved in a completely inelastic collision. The first ball has a mass of 0.25 kg and an initial velocity of 9.27 m/s in the xdirection The second ball has a mass of 0.50 kg with an initial velocity of 2.61 m/s in the xdirection. What is the speed of the two balls after the collision in m/s?

m1•v1 m2•v2 =(m1+m2) •u,
u= (m1•v1 m2•v2)/(m1+m2)