Question

A freight car with a mass of 25000 kg25 000\ \mathrm{kg} rolls down an inclined track through a vertical distance of 1.5 m1.5\ \mathrm{m}. At the bottom of the incline , on a level track, the car collides and couples with an identical freight car that was at rest. What percentage of the initial kinetic energy is lost in the collision?

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The freight car of mass

m=25000 kgm=25000\text{ kg}

rolls down the incline track through a vertical distance

h=1.5 mh=1.5\text{ m}

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