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Two people are standing on a 2.5 m longplatform, one at each end. The platform floats parallel to the ground on a cushion of air, like a hovercraft. One person throws a6.6 kg ball to the other, who catches it. The ball travels nearly horizontally. Excluding the ball, the totalmass of the platform and people is 116 kg. Because of the throw, this 116 kg massrecoils. How far does it move before coming to rest again?

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