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A 4 kg mass moving with a speed of 2 m / s, and a 2...

A 4 kg mass moving with a speed of 2 m / s, and a 2 kg mass moving with a speed of 4 m / s, slide on a horizontal surface without friction. Both objects encounter the same horizontal force, which is directly opposed to their movement, and are stopped by it. Which statement best describes their respective stopping distances?
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