#### Question

A freight car with a mass of $25 000\ \mathrm{kg}$ rolls down an inclined track through a vertical distance of $1.5\ \mathrm{m}$. 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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#### Step 1

1 of 10

The freight car of mass

$m=25000\text{ kg}$

rolls down the incline track through a vertical distance

$h=1.5\text{ m}$

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