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Q. Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. The lasers produce separate interference patterns on a screen a distance 5.80 {rm m} away from the slits.What is the distance Delta y_max-max between the first maxima (on the same side of the central maximum) of the two patterns? What is the distance Delta y_max-min between the second maximum of laser 1 and the third minimum of laser 2, on the same side of the central maximum?

Q. Starting from rest, a speedboat reaches a speed of 3.0 m/s in 3.7 s. What is the boat's speed after an additional 2.5 s has elapsed, assuming the boat's acceleration remains the same?

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