A 3.000 u object moving to the light through a laboratory at 0.8c collides with a 4.000 u object moving to the left through the laboratory at 0.6c. Afterward, there are two objects, one of which is a 6.000 u mass at rest.
(a) What are the mass and speed of the other object?
(b) Determine the change in kinetic energy in this collision.
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