A 15.0 kg object moving in the +x direction at 5.5 m/s collides head-on with a 10 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 15.0-kg is at rest after the collision;
• (d) the 10.0 kg object is at rest after the collision
• (e) the 15.0-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"?