two people are standing on a 2.84-m-long platform, one at each end.The platform

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two people are standing on a 2.84-m-long platform, one at each end.The platform floats parallel to the ground on a cushion of air,like a hovercraft. The two people, the platform and a 3.13-kg ballare all initially at rest. One person throws the 3.13-kg ball tothe other, who catches it. The ball travels nearly horizontally.Excluding the ball, the total mass of the platform and people is176 kg. Because of the throw, this 176-kg mass recoils. How fardoes the platform move before coming to rest again?

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