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# Lect7 - Average and Instantaneous Speed A moving body's...

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92.131 Lecture 7 1 of 9 Ronald Brent © 2009 All rights reserved. Average and Instantaneous Speed A moving body’s average speed during a time interval is defined as the distance covered divided by the elapsed time. As this time interval gets smaller and smaller the value we approach is called the instantaneous speed. Suppose 2 16 t y = is the distance (in feet) an object has moved in a time interval (in seconds), then computing the change in y (denoted y Δ ) and the time elapsed (denoted t Δ ,) one can calculate the average velocity in that time interval. For example the average velocity in the first 2 seconds is sec / ft 32 0 2 ) 0 ( 16 ) 2 ( 16 2 = = Δ Δ t y The average velocity during the 1 second interval between second 1 and second 2 is sec / ft 48 1 2 ) 1 ( 16 ) 2 ( 16 2 = = Δ Δ t y

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