A freight car with a mass of 2500 kg rolls down an, Physics

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A freight car with a mass of 2500 kg rolls down an

A freight car with a mass of 2500 kg rolls down an inclinedtrack through a vertical distance of 1.5m. at the bottom of theincline, on a level track, the car collides and couples with anidentical freight car that was at rest. What percentage of the initial kinetic energy is lost in the collision?

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