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help please PHYSICS 11 / 20 19. When timing a 100m run, officials at the finish line are instructed to start their stopwatch at the

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PHYSICS 11 / 20 19. When timing a 100m run, officials at the finish line are instructed to start their stopwatch at the sight of smoke from the starter's pistol rather than the sound of the pistol's firing. What would be the difference in time if they used sound? Show all work

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