Calculate velocity column

t 1 2 3 4 5 6 7 8 9 10 11 Time s 0.035 0.049 0.104 0.134 0.169 0.234 0.289 0.389 0.553 0.653 0.714 Position cm -80 -75 -55 _45 -35 -20 -10 -5 -20 -35 p Velocity cm/s