A 6.0-kg object moving in the +x direction at 5.5 m/s collides head on with an 8.0-kg object moving.

A 6.0-kg object moving in the +x direction
at 5.5 m/s collides head on with an 8.0-kg object moving in the -x direction at
4.0 m/s. Find the final velocity of each mass if: (a) the objects stick
together; (b) the collision is elastic; (c) the 6.0-kg object is at rest after
the collision; (d) the 8.0-kg object is at rest after the collision; (e) the
6.0-kg object has a velocity of 4.0 m/s in the -x direction after the
collision. Are the results in (c), (d), and (e) “reasonable”? Explain.