Chapter 7, Problem 11P

The velocity of a falling parachutist is given by

$v=\frac{gm}{c}\left(1-e^{-\left(c/m\right)t}\right)$

Where $g=9.81{\text{m/s}}^2$. For a parachutist with a drag coefficient $c=15\text{ kg/s}$, compute the mass m so that the velocity is $v=35\text{m/s at }t=8s$. Use Excel, MATLAB or Mathcad to determine m.