Suppose that, after falling for 13 s, the parachutist from Examples 1.1 and 1.2 pulls the rip cord. At this point, assume that the drag coefficient is instantaneously increased to a constant value of 55 kg/s. Compute the parachutist’s velocity from t = 0 to 30 s with Heun’s method (without iteration of the corrector) using a step-size of 2 s. Plot υ versus t for t = 0 to 30 s.