Download - 49. Two 20 kg balls moving at 4 m/s, East strike a wall. Ball a bounces backwards at the same speed. Ball b stops. Which statement correctly describes the change in momentum of the two balls? a

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Title: "49. Two 20 kg balls moving at 4 m/s, East strike a wall. Ball a bounces backwards at the same speed. Ball b stops. Which statement correctly describes the change in momentum of the two balls? a"

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