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The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

World class speed skaters can skate a 3,000-m course in about 4 minutes.what is their average speed for this course? a. 12.5 m/sb. 1.33 m/sc. 1.25 m/sd. 13.3 m/s

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain