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Q. A car traveling at a speed of vo = 45 m/s stops smoothly (that is, its deceleration is constant) over a distance of d = 179 m. What is its acceleration during the time that it is stopping?

Q. An astronaut is rotated in a horizontal centrifuge at a radius of 7.5 m. (a) What is the astronaut's speed if the centripetal acceleration has a magnitude of 5.4g? (b) How many revolutions per minute are required to produce this acceleration?

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