average       delta_t                     delta_v
 time           time        change in       speed       change in    avg accel
 (s)            (s)         time (s)        (cm/s)     speed (cm/s)   (cm/s*s)
------------------------------------------------------------------------------
0.75 +/- 0.1                               35 +/- 14  

              1.0 +/- 0.1   0.5 +/- 0.2  

1.25 +/- 0.1                             



1.75 +/- 0.1                              



2.25 +/- 0.1                   



2.75 +/- 0.1                            



3.25 +/- 0.1                                  

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