A 34000-kg railroad freight car collides with a stationary caboose car. They couple together, and 23 percent of the initial kinetic energy is dissipated as heat, sound, vibrations, and so on. What is the mass of the caboose?(adsbygoogle = window.adsbygoogle || []).push({});

m1v1= (m1+m2)vf

KEbefore= .23KEcollision

I don't know how to set up the last equation so that velocities cancel. I am not sure how to set up the kinetice energy equation, please help! thank you!

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# Freight car-caboose collision finding mass without velocities

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