Chapter 1, Problem 5P

Compute the velocity of a free-falling parachutist using Euler's method for the case where $m=80$kg and $c=10$kg/s. Perform the calculation from $t=0$ to 20 s with a step size of 1 s. Use an initial condition that the parachutist has an upward velocity of 20 m/s at $t=0$. At $t=10$s, assume that the chute is instantaneously deployed so that the drag coefficient jumps to 60 kg/s