Middle of
time   
interval    Change in position     Change in time       Average velocity
  (s)            (cm)                   (s)               (cm/s)
-------------------------------------------------------------------
                                                
 0.75     25.1 -   7.0 =  18.1    1.0   -  0.5    = 0.5       36.2
           0.3     0.1     0.4    0.005    0.005    0.01       1.5



 
 1.25     58.2 -  25.1 =  33.1    1.5   -  1.0    = 0.5       66.2
           0.2     0.3     0.5    0.005    0.005    0.01       2.1





 1.75






 2.25






 2.75






 3.25



-------------------------------------------------------------------