<PRE><B>Question 1062442</B>
An airplane started at rest on one end of a 1.5 mile runway. The plane accelerated so that it reached take-off speed of 150 mph a quarter-mile before reaching the other end of the runway. What was the plane&#39;s acceleration?
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Assuming uniform acceleration:  150 mi/hr in 1.25 miles
1.25 miles = 6600 feet
150 mi/hr = 220 ft/sec
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Its average speed on the runway = 110 ft/sec
Time rolling = 6600 ft/110 ft/sec = 60 seconds
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Accel 220/60 = (11/3) ft/sec/sec</PRE>