The position of a car is given by the values in the table.

[math]

Find the average velocity for the time period beginning when [math] and lasting
(1) 3 seconds, (2) 2 seconds, (3) 1 second

(Using the graph, one can estimate the instantaneous velocity when [math] to be about 28 ft/s.)

(1) ft/s
(2) ft/s
(3) ft/s

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