matplotblog May 27, 2020  typo, should be:  plt.plot( time, distance, 'bo-')

first code block, line 4:
second code block, line 3:
third code block, line3:
``plt.plot(distance,'bo-')`` should be ``plt.plot(time, distance, 'bo-')``

I did not see a comment section at the blog itself.
