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The position of a particle moving with constant acceleration is given by x(t) = 2t2 +...

The position of a particle moving with constant acceleration is given by x(t) = 2t2 + 8t + 4 where x is in meters and t is in seconds.

(a) Calculate the average velocity of this particle between t = 6 seconds and t = 9 seconds.
  (b) At what time during this interval is the average velocity equal to the instantaneous velocity?
  

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