HW$1\_3$ Use fplot for this problem

Make sure to run the command pip install fplot at the console panel to install this package. You would need to do this only once with your computer connected to a stable internet. After that you would need to use import fplot as $fl$ in your code to access the plot function in this library.

Starting from rest, the velocity attained by a falling body of mass $m$ after $t$ seconds of flight is expressed by the following expression:

$v=\sqrt[\phantom{2}]{\frac{gm}{c_d}}tanh(\sqrt[\phantom{2}]{\frac{g{c}_d}{m}}t)$

where the acceleration due to gravity, $g=9\mathrm{.}81\frac{m}{s^2}$ and the drag coefficient $c_d=0\mathrm{.}25k\frac{g}{m}.$