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Q. A 430g football is lying on the ground, then is kicked and is moving at 25.00 m/s. If the period of the impact was 0.001 s, what was the average force on the ball?

Q. Coherent light with wavelength 594 passes during two very narrow slits, and the interference pattern is observed on a screen a distance of 3 from the slits. The first-order bright fringe is a distance of 4.80 from the center of central bright fringe. For what wavelength of light will first-order dark fringe be observed at this same point on the screen?

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