An empty freight car of mass 10,000 kg rolls at 2 m/s along a level track and collides with a loaded car of mass 20,000 kg, standing at rest with brakes released. If the  cars couple together A) find their speed after the collision b) find the decrease in  kinetic energy as a result of the collision c) With what velocity should the loaded car be rolling toward the empty car, in order that both shall be brought to rest by collision.

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