function yprime = Skydive2(t,y)
% yprime = Skydive2(t,y)
% t (time) and y (velocity v(t)) are scalars.
%
% yprime is the derivative of y at time t.
% 
% The following parameters are rough estimates
g = 9.81;  % gravitational constant (in m/s^2)
c = 0.225;  % drag coefficient (in kg/m)
m = 68.1;  % mass of skydiver (in kg)

yprime = g - (c/m)*y^2;
