The position of a pinewood derby car

The position of a pine wood derby car was observed at various times; the results are summarized in the following table. Find the average velocity of the car for
(a) The first second,
(b) The last 3 s, and
(c) The entire period of observation.
t(s) 0 1.0 2.0 3.0 4.0 5.0
x(m) 0 2.3 9.2 20.7 36.8 57.5
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