Which of the following collisions qualify as totally inelastic? (a) Two equal-mass objects approach from opposite directions at different speeds. They collide head-on and stick together; the combined object continues to move; (b) two equal-mass objects approach from opposite directions at the same speed. They collide head-on and stick together; the combined object is then at rest; (c) two equal-mass objects approach from opposite directions at the same speed. They collide head-on and rebound, but with lower speed than before.
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