Hello Sayeed,
You could use the "interp1" function to interpolate your data set over equal spaced time steps. The documentation for the "interp1" function can be found here: https://www.mathworks.com/help/matlab/ref/interp1.html
Using your data as an example, you can interpolate the cooresponding velocities for a vector of time values as follows:
t = 0:.1:120; % Define a vector from 0 to 120 seconds, spaced by .1 seconds
vq = interp1(time,vel,t); % Interpolate the cooresponding values using your data set.
plot(t,vq) % plot the new data set
hold on
plot(t,vq, 'r*') % plot the old data set as red '*'
