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Two railroad cars collide. Car 1 has a mass of 10,000 kg and is moving to...

Two railroad cars collide. Car 1 has a mass of 10,000 kg and is moving to the right at 5 m/s. It collides inelastically with a 20,000 kg car moving at 1 m/s to the right. How much energy was lost in the collision?

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