A (0.50-mathrm{kg}) wood block slides (0.50 mathrm{~m}) on a horizontal floor before colliding elastically with a wall

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A \(0.50-\mathrm{kg}\) wood block slides \(0.50 \mathrm{~m}\) on a horizontal floor before colliding elastically with a wall and reversing its direction of travel. If the block has an initial speed of \(1.0 \mathrm{~m} / \mathrm{s}\) and comes to rest exactly at its starting position, what is the magnitude of the frictional force between block and floor?

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