Please see attachments
ans. Va = 1.7 m/sec. right; Vb = 3.3 m/sec. right.
please address 165 specifically
Remember that liner momentum is always conserved.
Mass m1 of velocity v1 collides with a mass m2 of velocity v2, after collision, mass m1 will have velocity v3 and mass m2 will have velocity v4. And also,
m1v1 + m2v2 = m3v3 + m4v4
Clear explanations and all mathematical steps are provided.