Question: A 15.0-kg object moving in the + x direction at 5.5m/s collides head-on with a 10.0-kg object moving in the x direction at 4.0m/s.

A 15.0-kg object moving in the + x direction at 5.5m/s collides head-on with a 10.0-kg object moving in the – x direction at 4.0m/s. Find the final velocity of each mass if:
(a) The objects stick together;
(b) The collision is elastic;
(c) The 15.0-kg object 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 for the collision. Are the results in (c), (d) and (e) “reasonable”? Explain

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