A railroad freight car of mass 462 x 104 kg collides with a, Physics

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A railroad freight car of mass 462 x 104 kg collides with a

Problem: A railroad freight car of mass 4.62 x 10⁴ kg collides with a stationary caboose car. They couple together, and 40.0% of the initial kinetic energy is transferred to thermal energy, sound, vibrations, and so on.

Question: Find the mass of the caboose.

If possible just a brief explanation how you got the answer?

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Physics: A railroad freight car of mass 462 x 104 kg collides with a

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Physics: A railroad freight car of mass 462 x 104 kg collides with a

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