A ball of mass m(1) = 0.250 kg and initial v(1) = 5.00 m/s collides head-on with a ball of mass m(2) = 0.800 kg that is initially at rest. What are the velocities of the balls after the collision if they stick together?

Answer 1

m₁v₁=(m₁+m₂)u
u= m₁v₁/(m₁+m₂)