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A 745i BMW car can brake to a stop in a distance

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A 745i BMW car can brake to a stop in a distance of 121 ft. from a speed of 60.0 mi/h. To brake to a stop from a speed of 80.0 mi/h requires a stopping distance of 211 ft. What is the average braking acceleration for?
(a) 60 mi/h to rest,
(b) 80 mi/h to rest,
(c) 80 mi/h to 60 mi/h? Express the answers in mi/h/s and in m/s2

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