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Acceleration = (change in speed) / (time interval)

= (50 - 30) mph / 20 sec = (20 mi/hr) (1/3,600 hr/sec) (5,280 ft/mi) / (20 sec)

= (20 x 5,280) / (3,600 x 20) (mi - hr - ft / hr - sec - mi - sec)

= 1.4667 ft/sec2 (rounded, repeating)

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Q: If your speed was 30 miles an hour and you sped up 50 miles and hour in 20 seconds. What was your acceleration?
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