Question

A railroad freight car of mass 1.68 × 104 kg collides with a stationary caboose car....

A railroad freight car of mass 1.68 × 104 kg collides with a stationary caboose car. They couple together, and 21.0% of the initial kinetic energy is transferred to thermal energy, sound, vibrations, and so on. Find the mass of the caboose.

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